解答

角度

(3 - 7), (3 - 10)

arccos (\frac{79}{6322})

度数

6.49934 \dots^{\circ}

十进制

0.11343 \dots

求解步骤

(3 - 7), (3 - 10)

计算向量之间的角度:

cos (θ) = \frac{a \cdot b}{∣ a ∣ \cdot b}

a = (3 - 7), b = (3 - 10)

计算

\frac{a \cdot b}{∣ a ∣ \cdot b} : \frac{79}{6322}

cos (θ) = \frac{79}{6322}

= arccos (\frac{79}{6322})

流行的例子

cr i t i c a l x^{3} + x^{2} - 2 x

in f l ec t i o n \frac{x ^{2}}{x - 5}

in v erse f (x) = 2 x^{2} - 5 x + 6

d o main f (x) = x^{2} - 121

s l o p e 4 x + 3