Verify for all integers $\displaystyle n$,

$\displaystyle \cos {\frac {(2n+1)\pi}{2}}=0$.

Help? I know the double angle, half-angle, and sum and difference formulas, but I can't figure out how to verify it.

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- Feb 28th 2009, 10:14 AMchrozerVerifying
Verify for all integers $\displaystyle n$,

$\displaystyle \cos {\frac {(2n+1)\pi}{2}}=0$.

Help? I know the double angle, half-angle, and sum and difference formulas, but I can't figure out how to verify it. - Feb 28th 2009, 10:17 AMMoo
- Feb 28th 2009, 11:28 AMchrozer