arccos(2/(sqrt(30)))

解答

arccos (\frac{2}{30})

1.19700 \dots

十进制

68.58

求解步骤

arccos (\frac{2}{30})

整理为小数形式

= 1.19700 \dots

sin^{2} (\frac{π - 0.3125}{5})

arctan (\frac{12}{50})

1 1^{2} + 5^{2} - 2 (11) (5) cos (2 0^{\circ})

\frac{( 17 ) ( 9.8 )}{2 sin ( 2 2 ^{\circ} )}

10 - 2 \cdot tan^{2} (54. 7^{\circ})