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If thetain(pi/2,(3pi)/2), then the value...

If `thetain(pi/2,(3pi)/2)`, then the value of `sqrt(4cos^4theta+sin^2 2theta)+4cotthetacos^2(pi/4-theta/2)` is

A

`-2 cottheta`

B

`2 cottheta`

C

`2cos theta`

D

`2 sintheta`

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