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3sin(2x)-1cos(x)=0

Solução

3 sin (2 x) - 1 cos (x) = 0

x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn, x = 0.16744 \dots + 2 πn, x = π - 0.16744 \dots + 2 πn

Graus

x = 9 0^{\circ} + 36 0^{\circ} n, x = 27 0^{\circ} + 36 0^{\circ} n, x = 9.59406 \dots^{\circ} + 36 0^{\circ} n, x = 170.40593 \dots^{\circ} + 36 0^{\circ} n

Passos da solução

3 sin (2 x) - 1 \cdot cos (x) = 0

Reeecreva usando identidades trigonométricas

- 1 \cdot cos (x) + 3 sin (2 x)

Utilizar a identidade trigonométrica do arco duplo:

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

= - 1 \cdot cos (x) + 3 \cdot 2 sin (x) cos (x)

Simplificar

- 1 \cdot cos (x) + 3 \cdot 2 sin (x) cos (x) : - cos (x) + 6 sin (x) cos (x)

- 1 \cdot cos (x) + 3 \cdot 2 sin (x) cos (x)

Multiplicar:

1 \cdot cos (x) = cos (x)

= - cos (x) + 3 \cdot 2 sin (x) cos (x)

Multiplicar os números:

3 \cdot 2 = 6

= - cos (x) + 6 sin (x) cos (x)

= - cos (x) + 6 sin (x) cos (x)

- cos (x) + 6 cos (x) sin (x) = 0

Fatorar

- cos (x) + 6 cos (x) sin (x) : cos (x) (6 sin (x) - 1)

- cos (x) + 6 cos (x) sin (x)

Fatorar o termo comum

cos (x)

= cos (x) (- 1 + 6 sin (x))

cos (x) (6 sin (x) - 1) = 0

Resolver cada parte separadamente

cos (x) = 0 or 6 sin (x) - 1 = 0

cos (x) = 0 : x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

cos (x) = 0

Soluções gerais para

cos (x) = 0

cos (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} 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}

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

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

6 sin (x) - 1 = 0 : x = arcsin (\frac{1}{6}) + 2 πn, x = π - arcsin (\frac{1}{6}) + 2 πn

6 sin (x) - 1 = 0

Mova

1

para o lado direito

6 sin (x) - 1 = 0

Adicionar

1

a ambos os lados

6 sin (x) - 1 + 1 = 0 + 1

Simplificar

6 sin (x) = 1

6 sin (x) = 1

Dividir ambos os lados por

6

6 sin (x) = 1

Dividir ambos os lados por

6

\frac{6 sin ( x )}{6} = \frac{1}{6}

Simplificar

sin (x) = \frac{1}{6}

sin (x) = \frac{1}{6}

Aplique as propriedades trigonométricas inversas

sin (x) = \frac{1}{6}

Soluções gerais para

sin (x) = \frac{1}{6}

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

x = arcsin (\frac{1}{6}) + 2 πn, x = π - arcsin (\frac{1}{6}) + 2 πn

x = arcsin (\frac{1}{6}) + 2 πn, x = π - arcsin (\frac{1}{6}) + 2 πn

Combinar toda as soluções

x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn, x = arcsin (\frac{1}{6}) + 2 πn, x = π - arcsin (\frac{1}{6}) + 2 πn

Mostrar soluções na forma decimal

x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn, x = 0.16744 \dots + 2 πn, x = π - 0.16744 \dots + 2 πn

sin (4 x - 3) = cos (5 x - 6)

6 sin (2 x - 3 0^{\circ}) + 2 = 0

sin (x) = sin (\frac{π}{10})

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

sin (3 x) - sin (x) = - 2 sin (2 x) sin (x)