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OpenStudy (anonymous):
( (Sinx Cosy)+(Cosx Siny))/(Cosx Cosy) --------------------------------- ((Cosx Cosy)-(Sinx Siny))/(Cosx Cosy)
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OpenStudy (jit4won):
cosx cos y will cancel each other
OpenStudy (jit4won):
sinxcosy +cosxsiny = sin(x+y) and cosx cosy -sinx siny = cos (x+y) so your final answer will be sin(x+y)/Cos(x+y)= tan (x+y)
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