document.write( "Question 1196147: Prove that sin[2cos^-¹(x)]=(2x)√(1-x²) \n" ); document.write( "

Algebra.Com's Answer #828867 by ikleyn(52785) $\"\"$ $\"About$

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document.write( "It is simply another form of the identity\r\n" );
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document.write( "    sin(2a) = 2*sin(a)*cos(a),\r\n" );
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document.write( "where a = arccos(x), x = cos(a), sin(a) = .\r\n" );
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