SOLUTION: If sinA+sinB=x and cosA+cosB=y then prove that {{{Tan (A-B)/2}}}={{{+/- √(4-x^2-y^2)/(x^2+y^2)}}}

Question 1015624: If sinA+sinB=x and cosA+cosB=y then prove that =AMP Parsing Error of [+/- √(4-x^2-y^2)/(x^2+y^2)]: Invalid expression '/-√(4-x^2-y^2)/(x^2+y^2)': syntax error at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 203. .
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Please correct the statement of the problem if you want it to be solved.
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SOLUTION: If sinA+sinB=x and cosA+cosB=y then prove that {{{Tan (A-B)/2}}}={{{+/- &#8730;(4-x^2-y^2)/(x^2+y^2)}}}

SOLUTION: If sinA+sinB=x and cosA+cosB=y then prove that {{{Tan (A-B)/2}}}={{{+/- √(4-x^2-y^2)/(x^2+y^2)}}}