Răspunsuri

2014-01-20T18:14:43+02:00
Sin(x+y)+cos(x-y)=(sinx +cosx)(siny+cos y)
sinxcosy+cosxsiny+cosxcosy+sinxsiny=(sinx+cosx)(siny+cosy)
sinx(cosy+siny)+cos x(siny+cosy)=(sinx+cosx)(siny+cosy)
(siny+cosy)(sinx+cosx)=(sinx+cosx)(siny+cosy)
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