8-12.ELY )22 – InterviewSolution

InterviewSolution

1.	8-12.ELY )22
Answer» put the value of function in the below equation {COS(X/2)}² - {SIN(X/2)}². = 1-2SIN²(X/2) . we can use the standard formula for this as cos²(x) - sin²(x) = cos2x so here just replace x with x/2 so cos²(x/2) - sin²(x/2) = cos(x).

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