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  3. write the expression as the cosine of an angle, kn

Write the expression as the cosine of an angle, knowing that the expression is the...

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Write the expression as the cosine of an angle, knowing that the expression is the right side of the formula for cos (? - ?) with particular values for ? and ?.cos (160) cos (40) + sin (160) sin (40)cos (210)cos (190)cos (220)cos (120)

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