15*sin(40)

解答

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

9.64181 \dots

求解步骤

15 sin (4 0^{\circ})

整理为小数形式

= 9.64181 \dots

5 sec^{2} (\frac{π}{4})

\frac{12}{sin ( 6 0 ^{\circ} )}

sin (17 0^{\circ}) cos (2 0^{\circ}) - cos (17 0^{\circ}) sin (2 0^{\circ})

sin (6 0^{\circ}) \cdot 12

arctan (- \frac{2}{- 2})