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06-07-2017
Mathematics

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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?

Respuesta :

06-07-2017

A basic identity is:

sinα=cos(90-a)

In this case that means:

sin12°=cos(90-12)°

sin12°=cos78°

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