document.write( "Question 1015624: If sinA+sinB=x and cosA+cosB=y then prove that \"Tan+%28A-B%29%2F2\"=\"%2B%2F-+%26%238730%3B%284-x%5E2-y%5E2%29%2F%28x%5E2%2By%5E2%29\" \n" ); document.write( "
Algebra.Com's Answer #631976 by robertb(5830)\"\" \"About 
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