DifferentiationHard

Question

If y = cos-1 , then equals to

Options

A.
B.
C.
D.

Solution

Take θ = tan-1x,    so θ ∈ (-π/2, π/2)
then     y = cos-1   so |secθ| = secθ
or  y = θ/2   ⇒  y = tan-1 x
⇒  

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