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 >

2sin(30)cos(30)(1-2sin^2(30))

解答

2 sin (3 0^{\circ}) cos (3 0^{\circ}) (1 - 2 sin^{2} (3 0^{\circ}))

解答

\frac{3}{4}

+1

十进制

0.43301 \dots

求解步骤

2 sin (3 0^{\circ}) cos (3 0^{\circ}) (1 - 2 sin^{2} (3 0^{\circ}))

使用以下普通恒等式:

sin (3 0^{\circ}) = \frac{1}{2}

sin (3 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}

= \frac{1}{2}

使用以下普通恒等式:

cos (3 0^{\circ}) = \frac{3}{2}

cos (3 0^{\circ})

cos (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} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{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} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= \frac{3}{2}

= 2 \cdot \frac{1}{2} \cdot \frac{3}{2} (1 - 2 (\frac{1}{2})^{2})

化简

2 \cdot \frac{1}{2} \cdot \frac{3}{2} (1 - 2 (\frac{1}{2})^{2}) : \frac{3}{4}

2 \cdot \frac{1}{2} \cdot \frac{3}{2} (1 - 2 (\frac{1}{2})^{2})

分式相乘:

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

= \frac{1 \cdot 3 \cdot 2 ( 1 - 2 ( \frac{1}{2} ) ^{2} )}{2 \cdot 2}

约分:

2

= \frac{1 \cdot 3 ( 1 - 2 ( \frac{1}{2} ) ^{2} )}{2}

乘以:

1 \cdot 3 = 3

= \frac{3 ( - 2 ( \frac{1}{2} ) ^{2} + 1 )}{2}

2 (\frac{1}{2})^{2} = \frac{1}{2}

2 (\frac{1}{2})^{2}

(\frac{1}{2})^{2} = \frac{1}{2 ^{2}}

(\frac{1}{2})^{2}

使用指数法则:

(\frac{a}{b})^{c} = \frac{a ^{c}}{b ^{c}}

= \frac{1 ^{2}}{2 ^{2}}

使用法则

1^{a} = 1

1^{2} = 1

= \frac{1}{2 ^{2}}

= 2 \cdot \frac{1}{2 ^{2}}

分式相乘:

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

= \frac{1 \cdot 2}{2 ^{2}}

数字相乘:

1 \cdot 2 = 2

= \frac{2}{2 ^{2}}

约分:

2

= \frac{1}{2}

= \frac{3 ( - \frac{1}{2} + 1 )}{2}

化简

1 - \frac{1}{2} : \frac{1}{2}

1 - \frac{1}{2}

将项转换为分式:

1 = \frac{1 \cdot 2}{2}

= \frac{1 \cdot 2}{2} - \frac{1}{2}

因为分母相等，所以合并分式:

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

= \frac{1 \cdot 2 - 1}{2}

1 \cdot 2 - 1 = 1

1 \cdot 2 - 1

数字相乘:

1 \cdot 2 = 2

= 2 - 1

数字相减:

2 - 1 = 1

= 1

= \frac{1}{2}

= \frac{3 \frac{1}{2}}{2}

乘

3 \frac{1}{2} : \frac{3}{2}

3 \frac{1}{2}

分式相乘:

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

= \frac{1 \cdot 3}{2}

乘以:

1 \cdot 3 = 3

= \frac{3}{2}

= \frac{\frac{3}{2}}{2}

使用分式法则:

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

= \frac{3}{2 \cdot 2}

数字相乘:

2 \cdot 2 = 4

= \frac{3}{4}

= \frac{3}{4}

流行的例子

arccos((1.5)/8)

arccos (\frac{1.5}{8})

25 cos (3 7^{\circ})

100 \cdot sin (2 0^{\circ})

-1160sin(46)+570sin(22)

- 1160 sin (4 6^{\circ}) + 570 sin (2 2^{\circ})

10 tan (4 0^{\circ})