zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的三角函数 >

sin(x)cos(x^2)=sin(x),0<= x<= 2pi

解答

sin (x) cos (x^{2}) = sin (x), 0 \leq x \leq 2 π

解答

x = 0, x = π, x = 2 π, x = 2 π, x = 2 π, x = 6 π, x = 22 π

+1

度数

x = 0^{\circ}, x = 18 0^{\circ}, x = 36 0^{\circ}, x = 143.61922 \dots^{\circ}, x = 203.10825 \dots^{\circ}, x = 248.75578 \dots^{\circ}, x = 287.23844 \dots^{\circ}

求解步骤

sin (x) cos (x^{2}) = sin (x), 0 \leq x \leq 2 π

两边减去

sin (x)

sin (x) cos (x^{2}) - sin (x) = 0

分解

sin (x) cos (x^{2}) - sin (x) : sin (x) (cos (x^{2}) - 1)

sin (x) cos (x^{2}) - sin (x)

因式分解出通项

sin (x)

= sin (x) (cos (x^{2}) - 1)

sin (x) (cos (x^{2}) - 1) = 0

分别求解每个部分

sin (x) = 0 or cos (x^{2}) - 1 = 0

sin (x) = 0, 0 \leq x \leq 2 π : x = 0, x = π, x = 2 π

sin (x) = 0, 0 \leq x \leq 2 π

sin (x) = 0

的通解

sin (x)

周期表（周期为

2 πn

"）：

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = 0 + 2 πn, x = π + 2 πn

x = 0 + 2 πn, x = π + 2 πn

解

x = 0 + 2 πn : x = 2 πn

x = 0 + 2 πn

0 + 2 πn = 2 πn

x = 2 πn

x = 2 πn, x = π + 2 πn

在

0 \leq x \leq 2 π

范围内的解

x = 0, x = π, x = 2 π

cos (x^{2}) - 1 = 0, 0 \leq x \leq 2 π : x = 0, x = 0, x = 2 π, x = 2 π, x = 6 π, x = 22 π

cos (x^{2}) - 1 = 0, 0 \leq x \leq 2 π

将

1

到右边

cos (x^{2}) - 1 = 0

两边加上

1

cos (x^{2}) - 1 + 1 = 0 + 1

化简

cos (x^{2}) = 1

cos (x^{2}) = 1

cos (x^{2}) = 1

的通解

cos (x)

周期表（周期为

2 πn

）：

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

x^{2} = 0 + 2 πn

x^{2} = 0 + 2 πn

解

x^{2} = 0 + 2 πn : x = 2 πn, x = - 2 πn

x^{2} = 0 + 2 πn

0 + 2 πn = 2 πn

x^{2} = 2 πn

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

x = 2 πn, x = - 2 πn

化简

2 πn : 2 πn

2 πn

使用根式运算法则:

n ab = n a n b,

假定

a \geq 0, b \geq 0

= 2 πn

化简

- 2 πn : - 2 πn

- 2 πn

使用根式运算法则:

n ab = n a n b,

假定

a \geq 0, b \geq 0

= - 2 πn

x = 2 πn, x = - 2 πn

x = 2 πn, x = - 2 πn

在

0 \leq x \leq 2 π

范围内的解

x = 0, x = 0, x = 2 π, x = 2 π, x = 6 π, x = 22 π

合并所有解

x = 0, x = π, x = 2 π, x = 2 π, x = 2 π, x = 6 π, x = 22 π

作图

流行的例子

solvefor θ,(cos(θ))/(sin(θ))=-pi/6

so l v e f or θ, \frac{cos ( θ )}{sin ( θ )} = - \frac{π}{6}

tan(θ)=(10)/(-5.32)

tan (θ) = \frac{10}{- 5.32}

2sin(2x)+cos(2x)=4cos(2x)

2 sin (2 x) + cos (2 x) = 4 cos (2 x)

sec(t)= 1/((sqrt(2))/2)

sec (t) = \frac{1}{\frac{2}{2}}

-(cos(x)-sin(x))/(1+sin(2x))=0

- \frac{cos ( x ) - sin ( x )}{1 + sin ( 2 x )} = 0