document.write( "Question 848040: What is the exact value of cos(2θ) if sinθ=12/13 and θ is in quadrant II?
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Algebra.Com's Answer #510860 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"cos%282%2Atheta%29=1-2%2Asin%5E2%28theta%29\"$
\n" ); document.write( " $\"cos%282%2Atheta%29=1-2%2A%2812%2F13%29%5E2\"$
\n" ); document.write( " $\"cos%282%2Atheta%29=1-2%28144%2F169%29\"$
\n" ); document.write( " $\"cos%282%2Atheta%29=169%2F169-288%2F169%29\"$
\n" ); document.write( " $\"cos%282%2Atheta%29=-119%2F169%29\"$
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