document.write( "Question 1157399: Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula.
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Algebra.Com's Answer #780259 by ikleyn(52802) $\"\"$ $\"About$

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document.write( "(2 tan(5θ))/ (1 − tan^2(5θ)) = tan(5θ + 5θ) = tan(10θ).    ANSWER\r\n" );
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