(7sin(105))/(sin(35))

解答

\frac{7 sin ( 10 5 ^{\circ} )}{sin ( 3 5 ^{\circ} )}

11.78828 \dots

求解步骤

\frac{7 sin ( 10 5 ^{\circ} )}{sin ( 3 5 ^{\circ} )}

整理为小数形式

= 11.78828 \dots

500 \cdot cos (4 5^{\circ})

sec^{2} (\frac{π}{6}) - tan^{2} (\frac{π}{6}) - cos^{2} (\frac{π}{6})

20 \cdot sin (4 0^{\circ})

tan^{2} (6 1^{\circ})

100 \cdot sin (9 0^{\circ})