Find the derivative of the following functions:
cosec x
Let f(x) = cosec x, accordingly f(x + h) = cosec (x + h)
By first principle
=
=
= 
= 
= 
∴ f’(x) = -cosec x cot x
11
Find the derivative of the following functions:
cosec x
Let f(x) = cosec x, accordingly f(x + h) = cosec (x + h)
By first principle
=
=
=
=
=
∴ f’(x) = -cosec x cot x