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20 March, 16:05

Use double angle formulas to find the exact value of sin2x, cos2x, and tan2x

sinx=12/13, 0

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  1. 20 March, 16:31
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    Sin2x = 2sinxcosx;

    cos2x = (cosx) ^2 - (sinx) ^2;

    tan2x = (sin2x) / (cos2x);

    cosx = 5/13 from formula (sinx) ^2 + (cosx) ^2 = 1;

    => sin2x = 120/169;

    ...
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