1/8 [cos(0)+2cos(1/16)+2cos(1/4)+2cos(9/16)+cos(1)]

解答

\frac{1}{8} [cos (0) + 2 cos (\frac{1}{16}) + 2 cos (\frac{1}{4}) + 2 cos (\frac{9}{16}) + cos (1)]

0.89575 \dots

求解步骤

\frac{1}{8} [cos (0) + 2 cos (\frac{1}{16}) + 2 cos (\frac{1}{4}) + 2 cos (\frac{9}{16}) + cos (1)]

整理为小数形式

= 0.89575 \dots

arccos (\frac{24}{28})

sec (6 3^{\circ})

2 arctan (e^{0})

(sin (3 0^{\circ})) (cot (3 0^{\circ})) (tan (3 0^{\circ}))

35 tan (2) - 15.022 sec^{2} (2) + 1