DifferentiationHard

Question

y = cos-1 , then is equal to

Options

A.
B.
C.
D.

Solution

y = cos-1

⇒ 
⇒ 
⇒ 
when   x > 0

Alternate :
put x = tanθ
tan-1 x = θ  ∈ 
y = cos-1 = cos-1
y = cos-1 (cosθ/2)
y =

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