Ifcosx = cos60°cos30°+sin60°sin30°,then find the value of 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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