If cos 3x = cos60.cos30 + sin60.sin30+ 3cos30-4cos^3 30, find x
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Answer:
Cos 60 is 1/2
cos30 is √3/2
sin60 is √3/2
sin30 is 1/2
so cos60 × cos 30 + sin60 × sin30 = 2×(√3/4)= √3/2
cosx = √3/2
therefore x = 60
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the answer is unknown we don't know
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