cot(x)=-1/2

解答

cot (x) = - \frac{1}{2}

x = 2.03444 \dots + πn

度数

x = 116.56505 \dots^{\circ} + 18 0^{\circ} n

求解步骤

cot (x) = - \frac{1}{2}

使用反三角函数性质

cot (x) = - \frac{1}{2}

cot (x) = - \frac{1}{2}

的通解

cot (x) = - a \Rightarrow x = arccot (- a) + πn

x = arccot (- \frac{1}{2}) + πn

x = arccot (- \frac{1}{2}) + πn

以小数形式表示解

x = 2.03444 \dots + πn

43 sin (3 θ + 20) = 4 cos (3 θ + 20)

tan (x) = \frac{300}{400}

tan^{2} (x) - tan (x) = 0, (180, 270)

2 sin^{2} (θ) + 3 cos (θ) - 3 = 0

3 sin (x) tan (x) + 3 sin (x) = 0