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Find the exact value of cos 120°.

Question

Find the exact value of cos

120°.

A 1 Correct Answer Incorrect Answer

C -0.5 Correct Answer Incorrect Answer

D 0.5 Correct Answer Incorrect Answer

Solution

ATQ, cos 120° = cos(90 + 30) = - Sin 30° = -(1/2) 0r -0.5

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