Simplify the lefthandside so that LHS = RHS: cos(x) cos(x) 2 tan(x) 1+ sin(x) 1 – sin(x) Give the two expressions on the left a common denominator, and add them to obtain a single rational expression. In the numerator, factor out the common factor. In the denominator, multiply it out and simplify. Rewrite the denominator using the Pythagorean Identity

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