Limits and Derivatives
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The sum of the roots of the equation, <!-- [if gte mso 9]><xml>
</xml><![endif]-->is :
The sum of the roots of the equation, <!-- [if gte mso 9]><xml>
42. Find the derivative of the following functions:
(i)sin x cos x (ii) (iii)5 sec x + 4 cosx
(iv) (v)3cot x + 5 cosec x
(vi) (vii)
42. Find the derivative of the following functions:
(i)sin x cos x (ii) (iii)5 sec x + 4 cosx
(iv) (v)3cot x + 5 cosec x
(vi) (vii)
(i) f(x)=sin x cos x
So,
So,
(iii) Given f(x)=5 sec x+4 cosx.
So,
(v) Given,f(x)=3 cot x+5cosecx.
So,
29.
Given, f (x) = (x-a1) (x-a2)… (x-an)
So,
= (a1-a1) (a1-a2) … (a1-an)
= 0 (a1-a2) … (a1-an)
= 0
And
= (a-a1) (a-a2) … (a-an)

= 4
73. Given, f (x) =
So, f?(x) =
=
Kindly consider the following
72. (x + sec x) (x- tan x
Kindly consider the following
72. (x + sec x) (x- tan x
72. Given, f (x) = (x + sec x) (x tan x)
So, f?(x) = (x + see x)

Let g(x) = tan x.
So, g?(x) = ![]()

. _____ (2)
And P(x) = see x.


= tan x sec x. ____ (3)
Putting (2) and (3) in (1) we get,
f?(x) = (x + sec x) (1 - sec2x) + (x- tan x) (1 + tan x
71. Given, f (x) =

Dividing numerator and denominator by cos2x we get,

70. Given, f (x) =
So, f? (x) = 


