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2014-03-28T17:08:39+02:00
Sin 80=sin (90-10)=sin 90 cos 10-sin 10 cos 90=cos 10
sin 90=1, cos 90=0, => cos10 la patrat+sin 10 la patrat=1, cf formulei fundamentale a trigonometriei cos x la patrat +sinx la patrat=1(sau altfel spus cos patrat de x +sin patrat de x=1)
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