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人気のある三角関数 >

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

解

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

解

\frac{3}{4}

+1

十進法表記

0.43301 \dots

解答ステップ

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

次の自明恒等式を使用する:

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

sin (3 0^{\circ})

sin (x)

36 0^{\circ} n

循環を含む周期性テーブル:

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}

= \frac{1}{2}

次の自明恒等式を使用する:

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

cos (3 0^{\circ})

cos (x)

36 0^{\circ} n

循環を含む周期性テーブル:

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}

= \frac{3}{2}

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

簡素化

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})

分数を乗じる:

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}

共通因数を約分する:

2

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

乗算:

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}

指数の規則を適用する:

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

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

規則を適用

1^{a} = 1

1^{2} = 1

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

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

分数を乗じる:

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

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

数を乗じる:

1 \cdot 2 = 2

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

共通因数を約分する:

2

= \frac{1}{2}

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

結合

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

1 - \frac{1}{2}

元を分数に変換する:

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

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

分母が等しいので, 分数を組み合わせる:

\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

数を乗じる:

1 \cdot 2 = 2

= 2 - 1

数を引く:

2 - 1 = 1

= 1

= \frac{1}{2}

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

乗じる

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

3 \frac{1}{2}

分数を乗じる:

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

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

乗算:

1 \cdot 3 = 3

= \frac{3}{2}

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

分数の規則を適用する:

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

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

数を乗じる:

2 \cdot 2 = 4

= \frac{3}{4}

= \frac{3}{4}

人気の例

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})