mathematics

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

  • mathematics -

    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.
    http://www.intmath.com/analytic-trigonometry/4-half-angle-formulas.php

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

  • mathematics -

    Yo

  • mathematics -

    -y/x

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