document.write( "Question 1138392: If theta is a third quadrant angle and cos theta= -2/3, find sin theta. Show work. \n" ); document.write( "
Algebra.Com's Answer #756205 by ikleyn(52803)\"\" \"About 
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document.write( "\"sin%28theta%29\" = \"-sqrt%281+-+cos%5E2%28theta%29%29\" = \"-sqrt%281+-+%28-2%2F3%29%5E2%29\" = \"-sqrt%281+-+4%2F9%29\" = \"-sqrt%285%2F9%29\" = \"-sqrt%285%29%2F3\".\r\n" );
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document.write( "The sign at the square root  is \" - \" (MINUS), because the angle \"theta\" is in QIII, by the condition.\r\n" );
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\n" ); document.write( "\n" ); document.write( "It is your standard  \"mantra\",  which you should pronounce every time,  when you solve such a problem.\r
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