English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

cos(6x)=cos(2x)

Solução

cos (6 x) = cos (2 x)

Solução

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

Graus

x = 0^{\circ} + 18 0^{\circ} n, x = 9 0^{\circ} + 18 0^{\circ} n, x = 0^{\circ} + 9 0^{\circ} n, x = 4 5^{\circ} + 9 0^{\circ} n

Passos da solução

cos (6 x) = cos (2 x)

Subtrair

cos (2 x)

de ambos os lados

cos (6 x) - cos (2 x) = 0

Reeecreva usando identidades trigonométricas

- cos (2 x) + cos (6 x)

Use a identidade da transformação de soma em produto:

cos (s) - cos (t) = - 2 sin (\frac{s + t}{2}) sin (\frac{s - t}{2})

= - 2 sin (\frac{6 x + 2 x}{2}) sin (\frac{6 x - 2 x}{2})

Simplificar

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

- 2 sin (\frac{6 x + 2 x}{2}) sin (\frac{6 x - 2 x}{2})

\frac{6 x + 2 x}{2} = 4 x

\frac{6 x + 2 x}{2}

Somar elementos similares:

6 x + 2 x = 8 x

= \frac{8 x}{2}

Dividir:

\frac{8}{2} = 4

= 4 x

= - 2 sin (4 x) sin (\frac{6 x - 2 x}{2})

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

\frac{6 x - 2 x}{2}

Somar elementos similares:

6 x - 2 x = 4 x

= \frac{4 x}{2}

Dividir:

\frac{4}{2} = 2

= 2 x

= - 2 sin (4 x) sin (2 x)

= - 2 sin (4 x) sin (2 x)

- 2 sin (2 x) sin (4 x) = 0

Resolver cada parte separadamente

sin (2 x) = 0 or sin (4 x) = 0

sin (2 x) = 0 : x = πn, x = \frac{π}{2} + πn

sin (2 x) = 0

Soluções gerais para

sin (2 x) = 0

sin (x)

tabela de periodicidade com ciclo de

2 πn

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}

2 x = 0 + 2 πn, 2 x = π + 2 πn

2 x = 0 + 2 πn, 2 x = π + 2 πn

Resolver

2 x = 0 + 2 πn : x = πn

2 x = 0 + 2 πn

0 + 2 πn = 2 πn

2 x = 2 πn

Dividir ambos os lados por

2

2 x = 2 πn

Dividir ambos os lados por

2

\frac{2 x}{2} = \frac{2 πn}{2}

Simplificar

x = πn

x = πn

Resolver

2 x = π + 2 πn : x = \frac{π}{2} + πn

2 x = π + 2 πn

Dividir ambos os lados por

2

2 x = π + 2 πn

Dividir ambos os lados por

2

\frac{2 x}{2} = \frac{π}{2} + \frac{2 πn}{2}

Simplificar

x = \frac{π}{2} + πn

x = \frac{π}{2} + πn

x = πn, x = \frac{π}{2} + πn

sin (4 x) = 0 : x = \frac{πn}{2}, x = \frac{π}{4} + \frac{πn}{2}

sin (4 x) = 0

Soluções gerais para

sin (4 x) = 0

sin (x)

tabela de periodicidade com ciclo de

2 πn

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}

4 x = 0 + 2 πn, 4 x = π + 2 πn

4 x = 0 + 2 πn, 4 x = π + 2 πn

Resolver

4 x = 0 + 2 πn : x = \frac{πn}{2}

4 x = 0 + 2 πn

0 + 2 πn = 2 πn

4 x = 2 πn

Dividir ambos os lados por

4

4 x = 2 πn

Dividir ambos os lados por

4

\frac{4 x}{4} = \frac{2 πn}{4}

Simplificar

x = \frac{πn}{2}

x = \frac{πn}{2}

Resolver

4 x = π + 2 πn : x = \frac{π}{4} + \frac{πn}{2}

4 x = π + 2 πn

Dividir ambos os lados por

4

4 x = π + 2 πn

Dividir ambos os lados por

4

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

Simplificar

x = \frac{π}{4} + \frac{πn}{2}

x = \frac{π}{4} + \frac{πn}{2}

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

Combinar toda as soluções

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

Exemplos populares

cot(x)cos(x)-sin(x)=1

cot (x) cos (x) - sin (x) = 1

cos^4(x)+cos^3(x)-2=0

cos^{4} (x) + cos^{3} (x) - 2 = 0

tan^2(x)= 1/(cos(x)+1)

tan^{2} (x) = \frac{1}{cos ( x ) + 1}

(sin^2(x)-2cos(x)+1)/4 =0

\frac{sin ^{2} ( x ) - 2 cos ( x ) + 1}{4} = 0

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

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