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

If `r=[2phi+cos^2(2phi+pi/4)]^(1//2)`, then `dr//dphi` at `phi=pi//4`

A

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

B

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

C

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

D

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

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The correct Answer is:
D
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