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If f(x)=cos^(2)x+cos^(2)(x+60^(@))+cos^(...

If `f(x)=cos^(2)x+cos^(2)(x+60^(@))+cos^(2)(x-60^(@)) and g(3//2)=5` then `(gof)(x)=`

A

0

B

1

C

5

D

`15//2`

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