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multiply by pi/180

Radians to Degrees:
multiply by 180/pi

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Graph of cos

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To find the inverse function of cosine, on your calculator you press 2nd then cos. you use this when you're given a decimal and or a fraction and trying to find degrees.

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Using radians and degrees

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tan=opposite over adjacent

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Cos=X
Sin=Y

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(a² + b² = c²) to write an equation to be solved. Remember that a and b are the legs and c is the hypotenuse (the longest side or the side opposite the 90º angle).