Question

Hello Mates ♥️

Please answer the following questions shared in the pic...

Class- 11th

No need to spam
​

Answer 1

Step-by-step explanation:

Q. 1)derivate cos x.

$\frac{d}{dx} cosx = \frac{d}{dx}sin( \frac{\pi}{2} - x) \\ \: \: \: \: \: \: \: \: \: \: \: = cos( \frac{\pi}{2} - x). \frac{d}{dx} ( \frac{\pi}{2} - x) \\ \: \: \: \: \: \: \: = sinx ( - 1) \\ \: \: \: \: \: \: \: \: \: = - sinx$

:)

Answer 2

Step-by-step explanation:

as it is very long so u can go for a book

but if u have any doubt u can ask

but

cosx = -sinx

cosecx = -cosecx.cotx

cotx = -cosec^2x