trig

if sin2x=3sin2y,
prove that:
2tan(x-y)=tan(x+y)

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  1. Do you mean sin(2x) or sin^2(x) ?
    Similarly, do you mean sin(2y) or sin^2 (y) ?

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  2. if sin2x=3sin2y,
    prove that:
    2tan(x-y)=tan(x+y)

    ( here, in sin2x, 2x is an angle., like there's a formula:sin2x=2sinxcosx and sin2y=2sinycosy; ....)

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