document.write( "Question 919036: write the expression as sine, cosine or tangent of an angle. Then find the exact value of the expression.\r
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Algebra.Com's Answer #557438 by Alan3354(69443)\"\" \"About 
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write the expression as sine, cosine or tangent of an angle. Then find the exact value of the expression.\r
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\n" ); document.write( "sin(A+B) = sin(A)cos(B) + sin(B)cos(A)
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