document.write( "Question 1203962: If \"+cos%28beta%29+=+-3+%2F+5+\" then, without a calculator, find \"cos%28pi+%2F+2+-+beta%29+\". Write your answer as a fraction. \n" ); document.write( "
Algebra.Com's Answer #839985 by MathTherapy(10557)\"\" \"About 
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document.write( "If \"+cos%28beta%29+=+-3+%2F+5+\" then, without a calculator, find \"cos%28pi+%2F+2+-+beta%29+\". Write your answer as a fraction.\r\n" );
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document.write( "\"cos%28beta%29+=+%28-+3%29%2F5+=+A%2FH+=+x%2Fr\",and its co-function is: \"cos%28pi%2F2+-+beta%29\", or \"sin%28beta%29\"\r\n" );
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document.write( "It may not be obvious to some but since x = - 3, and r = 5, we have here one of the many PYTHAGOREAN\r\n" );
document.write( "TRIPLES, the one of the form, 3-4-5. But, considering that cos is GIVEN as negative (< 0), \"beta\" (beta)\r\n" );
document.write( "is either in the 2nd or 3rd quadrant. This means that O (Opposite) = y = \"%22+%22%2B-+4\"\r\n" );
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document.write( "As such, .
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