The value of cos^(2)75^(@)+cos^(2)45^(@)...

The value of `cos^(2)75^(@)+cos^(2)45^(@)+cos^(2)15^(@)-cos^(2)30^(@)-cos^(2)60^(@)` is

A

0

B

1

C

`1//2`

D

`1//4`

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