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 = cos^2 A  sin^2 A
cos 2A = cos^2 A  sin^2A/cos^2 A ∙ cos^2 A
⇒ cos 2A = cos^2 A (1  tan^2 A)
⇒ cos 2A = 1/sec^2 A (1  tan^2 A)
⇒ cos 2A = 1  tan^2 A/1 + tan^2 A
11 and 12 Grade Math
From cos 2A in terms of tan A to HOME PAGE
Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.

New! Comments
Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.