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Prove that : sin^(2)((pi)/(6))+cos^(2)...

Prove that :
`sin^(2)((pi)/(6))+cos^(2)((pi)/(3))-tan^(2)((pi)/(4))=-(1)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
`-(1)/(2)`
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Knowledge Check

  • cos^(2)((pi)/(12))+cos^(2)((3pi)/(12))+cos^(2)((5pi)/(12))= …………

    A
    `-(1)/(2)`
    B
    0
    C
    `(1)/(2)`
    D
    `(3)/(2)`

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