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If xxx and yyy are acute angles such that
sinxsiny=12,cosxcosy=32, \frac {\sin x}{\sin y } = \frac {1}{2}, \quad \frac {\cos x}{\cos y } = \frac 3 2 , sinysinx=21,cosycosx=23,
what is tan2(x+y)? \tan^2 (x+y)?tan2(x+y)?
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