Calculati sin 70 grade minus cos 20 grade
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Răspuns :

sin(70°)=sin(90°- 20°)=cos(20°)

sin(70°) - cos(20°)=cos(20°)-cos(20°)=0
sin(70°)=sin(90°-20°)=cos(20°)
sin(70°)-cos(20°)=cos(20°)-cos(20°)=0