-80sin(40)

解答

- 80 sin (4 0^{\circ})

- 51.42300 \dots

求解步骤

- 80 sin (4 0^{\circ})

整理为小数形式

= - 51.42300 \dots

arccos (cot (\frac{π}{4}))

- 2 sin^{3} (0) cos (0) + 3 \cdot 0 - \frac{3}{2} sin (0)

arctan (\frac{3.3}{9.8} + 0.4)

\frac{20}{sin ( 6 0 ^{\circ} )}

8 cos^{2} (3 0^{\circ})