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If r = [ 2 phi +cos^2(2phi+pi//4)]^(1//2...

If `r = [ 2 phi +cos^2(2phi+pi//4)]^(1//2)` , then what is the value of the derivative of `dr// dphi` at `phi = pi//4` ?

A

`2((1)/(pi+1))^(1//2)`

B

`2((2)/(pi+1))^(2)`

C

`((1)/(pi+1))^(1//2)`

D

`2((2)/(pi+1))^(1//2)`

Text Solution

Verified by Experts

The correct Answer is:
D
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