cos(3.4)

解答

cos (3.4)

- 0.96679 \dots

求解步骤

cos (3.4)

整理为小数形式

= - 0.96679 \dots

\frac{tan ( 3 0 ^{\circ} ) + tan ( 6 0 ^{\circ} )}{1 - tan ( 3 0 ^{\circ} ) tan ( 6 0 ^{\circ} )}

sin (arccos (\frac{2}{3}) - arctan (\frac{1}{2}))

cos (7 5^{\circ}) cos (1 5^{\circ}) - sin (7 5^{\circ}) sin (1 5^{\circ})

\frac{22}{tan ( 1 2 ^{\circ} )}

cos (arctan (- \frac{2}{3}))