document.write( "Question 1086576: tan 2 theta × tan 3 theta =1.....then cos 5 theta =? \n" ); document.write( "

Algebra.Com's Answer #700840 by ikleyn(52814) $\"\"$ $\"About$

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document.write( "If   = 1   then\r\n" );
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document.write( "     =  - ,\r\n" );
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document.write( "    which implies   = ,\r\n" );
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document.write( "    and then   = 0.\r\n" );
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