Find the exact value of the expression. cos (30° + 120°) so:

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Find the exact value of the expression.
cos (30° + 120°)
cos (30° + 120°)=O
(Simplify your answer. Type an exact answer using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize all denominators.)
Transcribed Image Text:Find the exact value of the expression. cos (30° + 120°) cos (30° + 120°)=O (Simplify your answer. Type an exact answer using radicals as needed. Use integers or fractions for any numbers in the expression. Rationalize all denominators.)
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