document.write( "Question 1064582: Evaluate sin2x + cos2x when tanx = -2 \n" ); document.write( "

Algebra.Com's Answer #679654 by ikleyn(52903) $\"\"$ $\"About$

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\n" ); document.write( "Evaluate sin2x + cos2x when tanx = -2
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document.write( "Use the formulas of half argument written for 2x and x:\r\n" );
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document.write( "sin(2x) = ,  cos(2x) = .\r\n" );
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document.write( "For these formulas see, for example, the lesson\r\n" );
document.write( "    - FORMULAS FOR TRIGONOMETRIC FUNCTIONS \r\n" );
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document.write( "By applying them, you will get\r\n" );
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document.write( "sin(2x) + cos(2x) =  +  =  = .\r\n" );
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document.write( "Answer.  .\r\n" );
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