document.write( "Question 1012843: Sine theta = cos(2 theta-10) \n" ); document.write( "

Algebra.Com's Answer #629027 by ikleyn(52925) $\"\"$ $\"About$

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\n" ); document.write( "Sine theta = cos(2 theta-10)
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document.write( " = .   (1)\r\n" );
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document.write( "I don't know exactly what is 10: radians or degrees? Will suppose degrees.\r\n" );
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document.write( "We all know that\r\n" );
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document.write( " = .\r\n" );
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document.write( "Combining this with (1), you will get\r\n" );
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document.write( " = .\r\n" );
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document.write( "It implies that \r\n" );
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document.write( " = .   (2)\r\n" );
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document.write( "Not exactly, because you should remember about +/- and other similar additional terms, \r\n" );
document.write( "but I am going to give only the \"naive\" solution here.\r\n" );
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document.write( "From (2) you have\r\n" );
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document.write( " = 90° +10° = 100°.   Hence  = .100°.\r\n" );
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