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18 November, 21:04

What is the cofunction of cos 2pi / 9

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  1. 18 November, 21:30
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    The cofunction of cos is sin (90-x)

    90 degrees is equal to PI/2

    The cofunction becomes sin (PI/2 - 2PI/9)

    Rewrite both fractions to have a common denominator:

    PI/2 = 9PI/18

    2PI/9 = 4PI/18

    Now you have sin (9PI/18 - 4PI/18)

    Simplify:

    Sin (5PI/18)
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