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受欢迎的三角函数 >

(sin(180)}{20}=\frac{sin(a))/8

解答

\frac{sin ( 18 0 ^{\circ} )}{20} = \frac{sin ( a )}{8}

解答

a = 36 0^{\circ} n, a = 18 0^{\circ} + 36 0^{\circ} n

+1

弧度

a = 0 + 2 πn, a = π + 2 πn

求解步骤

\frac{sin ( 18 0 ^{\circ} )}{20} = \frac{sin ( a )}{8}

sin (18 0^{\circ}) = 0

sin (18 0^{\circ})

使用以下普通恒等式:

sin (18 0^{\circ}) = 0

sin (18 0^{\circ})

sin (x)

周期表（周期为

36 0^{\circ} n

"）：

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= 0

= 0

\frac{0}{20} = \frac{sin ( a )}{8}

交换两边

\frac{sin ( a )}{8} = \frac{0}{20}

在两边乘以

10

\frac{sin ( a )}{8} = \frac{0}{20}

在两边乘以

10

\frac{sin ( a )}{8} \cdot 10 = \frac{0}{20} \cdot 10

化简

\frac{sin ( a )}{8} \cdot 10 = \frac{0}{20} \cdot 10

化简

\frac{sin ( a )}{8} \cdot 10 : \frac{5 sin ( a )}{4}

\frac{sin ( a )}{8} \cdot 10

分式相乘:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{sin ( a ) \cdot 10}{8}

约分:

2

= \frac{5 sin ( a )}{4}

化简

\frac{0}{20} \cdot 10 : 0

\frac{0}{20} \cdot 10

使用法则

\frac{0}{a} = 0, a \neq = 0

\frac{0}{20} = 0

= 0 \cdot 10

使用法则

0 \cdot a = 0

= 0

\frac{5 sin ( a )}{4} = 0

\frac{5 sin ( a )}{4} = 0

\frac{5 sin ( a )}{4} = 0

在两边乘以

4

\frac{5 sin ( a )}{4} = 0

在两边乘以

4

\frac{4 \cdot 5 sin ( a )}{4} = 0 \cdot 4

化简

5 sin (a) = 0

5 sin (a) = 0

两边除以

5

5 sin (a) = 0

两边除以

5

\frac{5 sin ( a )}{5} = \frac{0}{5}

化简

sin (a) = 0

sin (a) = 0

sin (a) = 0

的通解

sin (x)

周期表（周期为

36 0^{\circ} n

"）：

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

a = 0 + 36 0^{\circ} n, a = 18 0^{\circ} + 36 0^{\circ} n

a = 0 + 36 0^{\circ} n, a = 18 0^{\circ} + 36 0^{\circ} n

解

a = 0 + 36 0^{\circ} n : a = 36 0^{\circ} n

a = 0 + 36 0^{\circ} n

0 + 36 0^{\circ} n = 36 0^{\circ} n

a = 36 0^{\circ} n

a = 36 0^{\circ} n, a = 18 0^{\circ} + 36 0^{\circ} n

作图

流行的例子

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

tan (4 x) = 12

4 csc (B) + 5 = 0

2cos(pi/5 x)=sqrt(3)

2 cos (\frac{π}{5} x) = 3

sin^2(x)+8sin(x)-1=0

sin^{2} (x) + 8 sin (x) - 1 = 0