Question

aratati ca sin² 30°+sin² 60°= 90°​

Answer 1

Explicație pas cu pas:

$\sin^{2} (30) + \sin^{2} (60) = {\left( \frac{1}{2} \right)}^{2} + {\left( \frac{ \sqrt{3} }{2} \right)}^{2} \\ = \frac{1}{4} + \frac{3}{4} = 1 = \sin(90)$