Question:

Which of the following is equal to cos (180º - Θ?

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a cos Θ

b -cos Θ

c sin Θ

d - sin Θ

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  1. cos (180 - x)

    = cos 180 cos x + sin 180 sin x

    = (-1)(cos x) + (0)(sin x)

    = - cos x

    B


  2. - 180

  3. answer is b
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