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人気のある三角関数 >

tan^2(x)+3=2sec^2(x)

解

tan^{2} (x) + 3 = 2 sec^{2} (x)

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

tan^{2} (x) + 3 = 2 sec^{2} (x)

両辺から

2 sec^{2} (x)

を引く

tan^{2} (x) + 3 - 2 sec^{2} (x) = 0

三角関数の公式を使用して書き換える

3 + tan^{2} (x) - 2 sec^{2} (x)

ピタゴラスの公式を使用する:

tan^{2} (x) + 1 = sec^{2} (x)

tan^{2} (x) = sec^{2} (x) - 1

= 3 + sec^{2} (x) - 1 - 2 sec^{2} (x)

簡素化

3 + sec^{2} (x) - 1 - 2 sec^{2} (x) : - sec^{2} (x) + 2

3 + sec^{2} (x) - 1 - 2 sec^{2} (x)

条件のようなグループ

= sec^{2} (x) - 2 sec^{2} (x) + 3 - 1

類似した元を足す:

sec^{2} (x) - 2 sec^{2} (x) = - sec^{2} (x)

= - sec^{2} (x) + 3 - 1

数を足す/引く:

3 - 1 = 2

= - sec^{2} (x) + 2

= - sec^{2} (x) + 2

2 - sec^{2} (x) = 0

置換で解く

2 - sec^{2} (x) = 0

仮定:

sec (x) = u

2 - u^{2} = 0

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

2 - u^{2} = 0

2

を右側に移動します

2 - u^{2} = 0

両辺から

2

を引く

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

簡素化

- u^{2} = - 2

- u^{2} = - 2

以下で両辺を割る

- 1

- u^{2} = - 2

以下で両辺を割る

- 1

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

簡素化

u^{2} = 2

u^{2} = 2

x^{2} = f (a)

の場合, 解は

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

u = 2, u = - 2

代用を戻す

u = sec (x)

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

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

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

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

人気の例

8 sin^{2} (θ) - 2 = 0

4sin(2x)sin(x)=4cos(x)

4 sin (2 x) sin (x) = 4 cos (x)

5 sin (3 x) - 1 = 3

- 5 sin (x) = 0

sin^2(θ)=6(cos(-θ)+1)

sin^{2} (θ) = 6 (cos (- θ) + 1)