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9 June, 17:10

The sine of 12 degrees is equal to 0.208, rounded to the nearest thousandth. What is the measure of an angle whose cosine is also equal to 0.208?

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  1. 9 June, 20:47
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    A basic identity is:

    sinα=cos (90-a)

    In this case that means:

    sin12°=cos (90-12) °

    sin12°=cos78°
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