document.write( "Question 868519: sin alpha = 3/5, pi/2 < alpha \n" ); document.write( "

Algebra.Com's Answer #523686 by Fombitz(32388) $\"\"$ $\"About$

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$\"sin%5E2%28alpha%29%2Bcos%5E2%28alpha%29=1\"$
\n" ); document.write( " $\"%283%2F5%29%5E2%2Bcos%5E2%28alpha%29=1\"$
\n" ); document.write( " $\"cos%5E2%28alpha%29=1-9%2F25\"$
\n" ); document.write( " $\"cos%28alpha%29=0+%2B-+4%2F5\"$
\n" ); document.write( "Since $\"pi%2F2%3Calpha%3Cpi\"$ ,
\n" ); document.write( " $\"cos%28alpha%29=-4%2F5\"$
\n" ); document.write( "..
\n" ); document.write( ".
\n" ); document.write( ".
\n" ); document.write( " $\"cos%28beta%29=-12%2F13\"$
\n" ); document.write( "Similarly,
\n" ); document.write( " $\"sin%28beta%29=sqrt%281-144%2F169%29\"$
\n" ); document.write( " $\"sin%28beta%29=0+%2B-+5%2F13\"$
\n" ); document.write( "Since $\"pi%3Cbeta%3C%283%2F2%29pi\"$
\n" ); document.write( " $\"sin%28beta%29=-5%2F13\"$
\n" ); document.write( " \n" ); document.write( "

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