I. Check if cos 60° = cos2 30°-sin2 30。 – InterviewSolution

1.	I. Check if cos 60° = cos2 30°-sin2 30。
Answer» cos60°=(cos30°)^2- (sin30°)^2 1/2. =(√3/2)^2- (1/2)^2 1/2. = 3/4 - 1/4 = 2/4 =1/2LHS= RHS

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