if sinA+sinB=x and cosA-cosB=y then find tan[(A-B)/2]

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  1. I don't know how many trig ratios of half-angles you have developed or know but here is a page where many of them are done.

    about 2/3 of the way down you should find
    tan [(A+B)/2) = (sinA +sinB)/(cosA + cosB)
    = x/y

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  2. -y/x

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  3. I think you should use the Power Reducing or Half Angle Formula in Trigonometry.

    Check out this link for the list of formulas - <a href=""> Trigonometry Formulas </a>

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