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We will learn how to express the multiple angle of cos 2A in terms of tan A.
Trigonometric function of cos 2A in terms of tan A is also known as one of the double angle formula.
We know if A is a number or angle then we have,
cos 2A = cos2 A - sin2 A
cos 2A = cos2A−sin2Acos2A ∙ cos2 A
⇒ cos 2A = cos2 A (1 - tan2 A)
⇒ cos 2A = 1sec2A(1 - tan2 A)
⇒ cos 2A = 1−tan2A1+tan2A
11 and 12 Grade Math
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