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The minimum positive period of the function y = cosx · cos (x - π / 3) is? Process urgent!
First of all, let's take a look at the form of the formula cos α x cos β, so we immediately associate it with the formula cos α · cos β = (1 / 2) [cos (α + β) + cos (α - β)] cos x · cos (x - π / 3) = (1 / 2) [cos (2x - π / 3) + cos π / 3] = (1 / 2) [cos (2x - π / 3) + 1 / 2, so the formula becomes
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