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人気のある三角関数 >

sec^4(x)-4=0

解

sec^{4} (x) - 4 = 0

解

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

+1

度

x = 4 5^{\circ} + 36 0^{\circ} n, x = 31 5^{\circ} + 36 0^{\circ} n, x = 13 5^{\circ} + 36 0^{\circ} n, x = 22 5^{\circ} + 36 0^{\circ} n

解答ステップ

sec^{4} (x) - 4 = 0

置換で解く

sec^{4} (x) - 4 = 0

仮定:

sec (x) = u

u^{4} - 4 = 0

u^{4} - 4 = 0 : u = 2, u = - 2, u = 2 i, u = - 2 i

u^{4} - 4 = 0

4

を右側に移動します

u^{4} - 4 = 0

両辺に

4

を足す

u^{4} - 4 + 4 = 0 + 4

簡素化

u^{4} = 4

u^{4} = 4

equationを

v = u^{2}

と以下で書き換える:

v^{2} = u^{4}

v^{2} = 4

解く

v^{2} = 4 : v = 4, v = - 4

v^{2} = 4

(g (x))^{2} = f (a)

の場合, 解は

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

v = 4, v = - 4

v = 4, v = - 4

再び

v = u^{2}

に置き換えて以下を解く:

u

解く

u^{2} = 4 : u = 2, u = - 2

u^{2} = 4

簡素化

4 : 2

4

数を因数に分解する:

4 = 2^{2}

= 2^{2}

累乗根の規則を適用する:

n a^{n} = a

2^{2} = 2

= 2

x^{2} = f (a)

の場合, 解は

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

u = 2, u = - 2

解く

u^{2} = - 4 : u = 2 i, u = - 2 i

u^{2} = - 4

4 = 2

4

数を因数に分解する:

4 = 2^{2}

= 2^{2}

累乗根の規則を適用する:

n a^{n} = a

2^{2} = 2

= 2

u^{2} = - 2

x^{2} = f (a)

の場合, 解は

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

u = - 2, u = - - 2

簡素化

- 2 : 2 i

- 2

累乗根の規則を適用する:

- a = - 1 a

- 2 = - 1 2

= - 1 2

虚数の規則を適用する:

- 1 = i

= 2 i

簡素化

- - 2 : - 2 i

- - 2

簡素化

- 2 : 2 i

- 2

累乗根の規則を適用する:

- a = - 1 a

- 2 = - 1 2

= - 1 2

虚数の規則を適用する:

- 1 = i

= 2 i

= - 2 i

u = 2 i, u = - 2 i

解答は

u = 2, u = - 2, u = 2 i, u = - 2 i

代用を戻す

u = sec (x)

sec (x) = 2, sec (x) = - 2, sec (x) = 2 i, sec (x) = - 2 i

sec (x) = 2, sec (x) = - 2, sec (x) = 2 i, sec (x) = - 2 i

sec (x) = 2 : x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

sec (x) = 2

以下の一般解

sec (x) = 2

sec (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} sec (x) 1 \frac{2 3}{3} 22 Undefined - 2 - 2 - \frac{2 3}{3} 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} sec (x) - 1 - \frac{2 3}{3} - 2 - 2 Undefined 22 \frac{2 3}{3}

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

sec (x) = - 2 : x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

sec (x) = - 2

以下の一般解

sec (x) = - 2

sec (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} sec (x) 1 \frac{2 3}{3} 22 Undefined - 2 - 2 - \frac{2 3}{3} 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} sec (x) - 1 - \frac{2 3}{3} - 2 - 2 Undefined 22 \frac{2 3}{3}

x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

sec (x) = 2 i :

解なし

sec (x) = 2 i

解なし

sec (x) = - 2 i :

解なし

sec (x) = - 2 i

解なし

すべての解を組み合わせる

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

グラフ

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