Question

sin^2*765градусов/1-cos*420градусов

Answer 1

Ответ:

1

Объяснение:

$\frac{sin^{2}(765)}{1-cos(420)}}$ = $\frac{(\frac{\sqrt{2} }{2} )^{2}}{1-\frac{1}{2} } =\frac{ \frac{1}{2} }{\frac{1}{2} } = 1$

1)sin(765°)=sin(45°+2×360°)=sin(45°)=√2/2

2)cos(420°)=cos(60°+360°)=cos(60°)=1/2