Sinx+siny=a;cosx+xosy=b than show that cos(x+y)=b^2-a^2/b^2+a^2

1.	Sinx+siny=a;cosx+xosy=b than show that cos(x+y)=b^2-a^2/b^2+a^2
Answer» arey use your brilliant logic ? This question i can\'t solve?

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