![]() ![]() ![]() We will choose to substitute the equation because subtracting the1 will cancel out the 1 already on the denominator. We start by substituting the two double angle formulae for sine and cosine. The tanx=sinx/cosx and the Pythagorean trigonometric identity of sin 2x+cos 2x=1 may also be needed. To simplify expressions using the double angle formulae, substitute the double angle formulae for their single-angle equivalents. Rewriting Expressions Using the Double Angle Formulae
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