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20 December, 11:34

Cos (x°) = sin (90 - x°) Using complete sentences, explain why an infinite number of x values that will prove the trigonometric identity to be true.

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  1. 20 December, 12:34
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    Cosx = sin (90-x)

    From the RHS,

    sin (90-x) = sin90cosx-cos90sinx

    Since sin90=1, cos90=0

    sin90cosx-cos90sinx=cosx-0=cosx (proven)
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