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sin 10grade+ sin 30 grade- sin 170 grade=[tex] \frac{1}{2} [/tex]

Răspuns :

Raluca98t
sin 10grade + sin 30grade - sin (180-10)grade = sin 10grade + sin 30grade - sin 10grade = sin 30grade = 1/2
Am aplicat reducerea la primul cadran, adica formula : sin (180-α) = sin α

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