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人気のある三角関数 >

6cos^2(x)+sin(x)-4=0

解

6 cos^{2} (x) + sin (x) - 4 = 0

解

x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn, x = 0.72972 \dots + 2 πn, x = π - 0.72972 \dots + 2 πn

+1

度

x = 21 0^{\circ} + 36 0^{\circ} n, x = 33 0^{\circ} + 36 0^{\circ} n, x = 41.81031 \dots^{\circ} + 36 0^{\circ} n, x = 138.18968 \dots^{\circ} + 36 0^{\circ} n

解答ステップ

6 cos^{2} (x) + sin (x) - 4 = 0

三角関数の公式を使用して書き換える

- 4 + sin (x) + 6 cos^{2} (x)

ピタゴラスの公式を使用する:

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

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

= - 4 + sin (x) + 6 (1 - sin^{2} (x))

簡素化

- 4 + sin (x) + 6 (1 - sin^{2} (x)) : sin (x) - 6 sin^{2} (x) + 2

- 4 + sin (x) + 6 (1 - sin^{2} (x))

拡張

6 (1 - sin^{2} (x)) : 6 - 6 sin^{2} (x)

6 (1 - sin^{2} (x))

分配法則を適用する:

a (b - c) = ab - a c

a = 6, b = 1, c = sin^{2} (x)

= 6 \cdot 1 - 6 sin^{2} (x)

数を乗じる:

6 \cdot 1 = 6

= 6 - 6 sin^{2} (x)

= - 4 + sin (x) + 6 - 6 sin^{2} (x)

簡素化

- 4 + sin (x) + 6 - 6 sin^{2} (x) : sin (x) - 6 sin^{2} (x) + 2

- 4 + sin (x) + 6 - 6 sin^{2} (x)

条件のようなグループ

= sin (x) - 6 sin^{2} (x) - 4 + 6

数を足す/引く:

- 4 + 6 = 2

= sin (x) - 6 sin^{2} (x) + 2

= sin (x) - 6 sin^{2} (x) + 2

= sin (x) - 6 sin^{2} (x) + 2

2 + sin (x) - 6 sin^{2} (x) = 0

置換で解く

2 + sin (x) - 6 sin^{2} (x) = 0

仮定:

sin (x) = u

2 + u - 6 u^{2} = 0

2 + u - 6 u^{2} = 0 : u = - \frac{1}{2}, u = \frac{2}{3}

2 + u - 6 u^{2} = 0

標準的な形式で書く

a x^{2} + b x + c = 0

- 6 u^{2} + u + 2 = 0

解くとthe二次式

- 6 u^{2} + u + 2 = 0

二次Equationの公式:

次の場合:

a = - 6, b = 1, c = 2

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 ( - 6 ) \cdot 2}{2 ( - 6 )}

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 ( - 6 ) \cdot 2}{2 ( - 6 )}

1^{2} - 4 (- 6) \cdot 2 = 7

1^{2} - 4 (- 6) \cdot 2

規則を適用

1^{a} = 1

1^{2} = 1

= 1 - 4 (- 6) \cdot 2

規則を適用

- (- a) = a

= 1 + 4 \cdot 6 \cdot 2

数を乗じる:

4 \cdot 6 \cdot 2 = 48

= 1 + 48

数を足す:

1 + 48 = 49

= 49

数を因数に分解する:

49 = 7^{2}

= 7^{2}

累乗根の規則を適用する:

n a^{n} = a

7^{2} = 7

= 7

u_{1, 2} = \frac{- 1 \pm 7}{2 ( - 6 )}

解を分離する

u_{1} = \frac{- 1 + 7}{2 ( - 6 )}, u_{2} = \frac{- 1 - 7}{2 ( - 6 )}

u = \frac{- 1 + 7}{2 ( - 6 )} : - \frac{1}{2}

\frac{- 1 + 7}{2 ( - 6 )}

括弧を削除する:

(- a) = - a

= \frac{- 1 + 7}{- 2 \cdot 6}

数を足す/引く:

- 1 + 7 = 6

= \frac{6}{- 2 \cdot 6}

数を乗じる:

2 \cdot 6 = 12

= \frac{6}{- 12}

分数の規則を適用する:

\frac{a}{- b} = - \frac{a}{b}

= - \frac{6}{12}

共通因数を約分する:

6

= - \frac{1}{2}

u = \frac{- 1 - 7}{2 ( - 6 )} : \frac{2}{3}

\frac{- 1 - 7}{2 ( - 6 )}

括弧を削除する:

(- a) = - a

= \frac{- 1 - 7}{- 2 \cdot 6}

数を引く:

- 1 - 7 = - 8

= \frac{- 8}{- 2 \cdot 6}

数を乗じる:

2 \cdot 6 = 12

= \frac{- 8}{- 12}

分数の規則を適用する:

\frac{- a}{- b} = \frac{a}{b}

= \frac{8}{12}

共通因数を約分する:

4

= \frac{2}{3}

二次equationの解:

u = - \frac{1}{2}, u = \frac{2}{3}

代用を戻す

u = sin (x)

sin (x) = - \frac{1}{2}, sin (x) = \frac{2}{3}

sin (x) = - \frac{1}{2}, sin (x) = \frac{2}{3}

sin (x) = - \frac{1}{2} : x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

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

以下の一般解

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

sin (x)

2 πn

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}

x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

sin (x) = \frac{2}{3} : x = arcsin (\frac{2}{3}) + 2 πn, x = π - arcsin (\frac{2}{3}) + 2 πn

sin (x) = \frac{2}{3}

三角関数の逆数プロパティを適用する

sin (x) = \frac{2}{3}

以下の一般解

sin (x) = \frac{2}{3}

sin (x) = a \Rightarrow x = arcsin (a) + 2 πn, x = π - arcsin (a) + 2 πn

x = arcsin (\frac{2}{3}) + 2 πn, x = π - arcsin (\frac{2}{3}) + 2 πn

x = arcsin (\frac{2}{3}) + 2 πn, x = π - arcsin (\frac{2}{3}) + 2 πn

すべての解を組み合わせる

x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn, x = arcsin (\frac{2}{3}) + 2 πn, x = π - arcsin (\frac{2}{3}) + 2 πn

10進法形式で解を証明する

x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn, x = 0.72972 \dots + 2 πn, x = π - 0.72972 \dots + 2 πn

グラフ

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