document.write( "Question 930587: Find the exact values of sin 2α, cos 2α, and tan 2α given the following information. \r
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document.write( "cos α = -4/5 90° < α < 180°\r
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document.write( "sin 2α = ?
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document.write( "cos 2α = ?
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document.write( "tan 2α = ? \n" );
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Algebra.Com's Answer #565129 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! This is all covered in great detail on wikipedia - half angle formulas. \n" ); document.write( " \n" ); document.write( " |