document.write( "Question 756018: cos(245)cos(5) + sin(245)sin(5) \n" ); document.write( "
Algebra.Com's Answer #459978 by lwsshak3(11628)\"\" \"About 
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cos(245)cos(5) + sin(245)sin(5)
\n" ); document.write( "Identity: cos(s-t)=cos s cos t+sin s sin t
\n" ); document.write( "cos(245)cos(5) + sin(245)sin(5)=sin(245-5)=sin 240º=-√3/2 (in Q3 where sin<0)
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