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Math Help - Double angle formula

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    Double angle formula

    Is it possible to input \frac{2\;tan\;\frac{\pi}{5}}{1-tan^2\;\frac{\pi}{5}} on a calculator? The tan^2 in the denominator is throwing me off.
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    Quote Originally Posted by TI-84 View Post
    Is it possible to input \frac{2\;tan\;\frac{\pi}{5}}{1-tan^2\;\frac{\pi}{5}} on a calculator? The tan^2 in the denominator is throwing me off.
    just enter \left( \tan \frac {\pi}5 \right)^2
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