exam Maths Puzzle Numerical Ability

Add this problem with unlike denominators:
4xy/x2-y2 + x-y/x+y

Thank you

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exam Other Question

These problems are really giving me some trouble, will someone please help!
If:
tanA=(-2/3) and 90 degrees < A < 180 degrees, find sinA.

Thank you again for your time, Natalie The second angle of a triangle is 3times the first and third is the 12 less than twice the first . Find the measure if the angles .