Class 12 Mathematics Chapter 6 Notes
The Mathematics subject is very demanding. It requires a strong foundation and regular practice to excel in this subject. The knowledge of basic concepts introduced in previous classes is essential to understanding the complex topics introduced in Class 12 Mathematics.
The Class 12 Mathematics Chapter 6 notes- Application of Derivatives is a continuation of Chapter 5. In the notes, students can find definitions of derivatives, increasing and decreasing functions, maxima and minima, tangents and normals, and some more concepts related to differentiation. Students will be asked to solve various problems using the first and second derivative tests. With the help of the Class 12 Mathematics Chapter 6 notes, students will learn to illustrate basic principles involved in the application of derivatives.
Extramarks, an online learning platform, provides a helping guide to gain an in-depth understanding of the concepts included in this chapter. It also aids in the preparation of class 12 boards and other national-level competitive examinations. The Class 12 Mathematics Chapter 6 notes include detailed and apt information, which ensures deep knowledge and sufficient practice.
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Key Topics Covered In Class 12 Mathematics Chapter 6 Notes
The key topics covered under Extramarks class 12 Mathematics chapter 6 notes include the following.
Rate of change of quantity:
A function y=f(x), then ddxy = f’(x) gives the rate of change of function f(x).
Let the function x= f(t) and y= f(t) be two functions such that variable x and y are varying to parameter t, then using Chain Rule, we get ddxy= ddtyddtx, ddtx 0
The rate of change of volume for decreasing side is given ddxy.
Decreasing and increasing functions:
Let a function f(x) be continuous in [p,q] and differential on (p,q), then
If f’ (x) = 0 x ∈ (p, q), then F is a constant function
If f’ (x) < 0 x ∈ (p, q), then F is a decreasing function
If f’ (x) > 0 x ∈ (p, q), then F is an increasing function
Tangent and Normal to a Curve:
A normal is a perpendicular line to the tangent. The straight-line equation passing through a point with slope m is given as y – y1= m (x – x1). If y= f (x) is a tangent to the curve at point P(x1, y1), then the slope is given as ddxy = f’(x).
Therefore, the equation becomes y – y1= ddxy (x – x1)
Another way of writing the equation of normal is y – y1= -ddyx (x – x1)
Length of tangent = y cosec = y 1+ (ddxy)2(ddxy)
Length of normal = y 1+ (ddxy)2
Slope of the curve:
Slope of normal at point P= -1Slope of tangent at point P = -1(ddxy) = -ddyx
If the normal is perpendicular to x-axis and parallel to y-axis at (x,y), then f’(x) = 0
If the normal is parallel to x-axis and perpendicular to y-axis at (x,y), then f’(x) = ∞
The angle of intersection of two curves:
If y= f1(x) and y = f2(x) are two curves that meet at point P(x1 , y1), then the angle of intersection of two curves is equal to the angle between the tangent of two curves at the point P.
The angle is given as tan = m1 – m21 + m1 m2
Slope m1 = ddxf1 and m2 = ddxf2
Maxima and Minima:
Differentiation is used to find the minima and maxima of a function. Minima is the lowest point, and Maxima is the highest point of a graph.
If f (x) ≤ f (a), when x=a, x in the domain, f(x) has absolute maximum at point a.
If f (x) ≥ f (a), when x=a, x (p, q), f (x) has a relative minimum.
If f (x) ≥ f (a), when x=a, x in the domain, f(x) has an absolute minimum at point a.
If f (x) ≤ f (a), when x=a, x (p, q), f (x) has a relative maximum.
Monotonicity:
Monotonic function: If the function f(x) is either decreasing or increasing in the domain.
Strictly increasing function: In function f(x), for every x1, x2 D. If x1> x2, then f(x1)> f(x2). i.e., when the value of x increases there is an increase in the function f(x) value.
Strictly decreasing function: In function f(x), for every x1, x2 D. If x1 x2, then f(x1) f(x2). i.e., when the value of x decreases there is a decrease in the function f(x) value.
Non-increasing function: In function f(x), for every x1, x2 D. If x1> x2, then f(x1) f(x2). i.e., when the value of x increases, the value of function f(x) would never increase.
Non-decreasing function: In function f(x), for every x1, x2 D. If x1> x2, then f(x1) f(x2). i.e., when the value of x decreases, the value of function f(x) would never decrease.
For a function f(x) differentiable on (a, b),
f’(x)>0, if the function is increasing and f’(x)<0, if the function is decreasing
Properties of Monotonicity:
If the function f(x) is strictly increasing, then f-1 exists on the domain and is strictly increasing.
If a continuous function f(x) is strictly increasing, then f-1 is also continuous on the domain [f(a), f(b)]
If the function f(x) and g(x) is strictly increasing (decreasing), then the composite function gof(x) exists on the domain and is strictly increasing (decreasing).
If either function f(x) or g(x) is strictly increasing and the other function is strictly decreasing, then the composite function gof(x) exists on the domain and is strictly decreasing.
Critical Points:
The points where the function f(x) is not differentiative, but its derivative is equal to zero are known as critical points. The point where the maxima and minima of a function occur are critical points; however, a critical point doesn’t necessarily imply that it is the maxima and minima of a function.
Points of inflection:
In a continuous function f(x), if the first derivative may or may not be zero but the second derivative at a point must be zero, then that point is known as the point of inflection. At this point, f’’(x) can change the sign.
Case 1: y=f(x) is concave downward when the f” (x) < 0, x ∈ (a, b) Case 2: y=f(x) is concave upward in interval (a, b) when the f” (x) > 0, x ∈ (a, b)
Applications of derivatives play a significant role in the branch of Physics. It helps in the study of seismology. With the help of graphs, loss and profit occurred can also be calculated. Also, derivatives have a range of applications like temperature, distance and speed.
Class 12 Mathematics Chapter 6 notes Exercises & Answer Solutions.
Chapter 6 mathematics class 12 notes provide a helping hand for students preparing for Class 12 board exams and other national level examinations such as the JEE Main, JEE Advanced, etc. The chapter- Application of derivatives holds relevance and is very important.
Students are advised to refer to the class 12 mathematics notes chapter 6 to resolve their doubts and clear the difficulties they face. These notes enable quick revision of formulas, definitions, and key points in a descriptive manner.
The class 12 chapter 6 mathematics notes, prepared by the subject elites, make sure that each student understands the concepts thoroughly. Students can develop time-management skills and analytical and problem-solving skills by practising a sufficient number of problems from the Class 12 Mathematics Chapter 6 notes.
Students may click on the link below to access the Extramarks Class 12 Mathematics notes.
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NCERT Exemplar Class 12 Mathematics
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Key Features of Class 12 Mathematics Chapter 6 notes
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