SOLUTION: Prove the following identity : (cos^2 theta - sin^2 theta)/(cos^2 theta + sin theta cos theta) = 1 - tan theta

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Question 1091335: Prove the following identity :
(cos^2 theta - sin^2 theta)/(cos^2 theta + sin theta cos theta) = 1 - tan theta
Answer by MathLover1(20850) About Me  (Show Source):