document.write( "Question 1082707: find the exact value of cos2(theta) if sin(theta)= -7/10 \n" ); document.write( "
Algebra.Com's Answer #696773 by Fombitz(32388)\"\" \"About 
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\"cos%5E2%28theta%29%2Bsin%5E2%28theta%29=1\"
\n" ); document.write( "\"cos%5E2%28theta%29%2B%28-7%2F10%29%5E2=1\"
\n" ); document.write( "\"cos%5E2%28theta%29=1-49%2F100\"
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