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

Solução

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

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

Graus

x = 6 0^{\circ} + 36 0^{\circ} n, x = 30 0^{\circ} + 36 0^{\circ} n, x = 27 0^{\circ} + 36 0^{\circ} n

Passos da solução

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

Fatorar

2 sin (x) cos (x) - sin (x) + 2 cos (x) - 1 : (2 cos (x) - 1) (sin (x) + 1)

2 sin (x) cos (x) - sin (x) + 2 cos (x) - 1

= (2 sin (x) cos (x) - sin (x)) + (2 cos (x) - 1)

Fatorar

sin (x)

2 sin (x) cos (x) - sin (x)

sin (x) (2 cos (x) - 1)

2 sin (x) cos (x) - sin (x)

Fatorar o termo comum

sin (x)

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

= (2 cos (x) - 1) + sin (x) (2 cos (x) - 1)

Fatorar o termo comum

2 cos (x) - 1

= (2 cos (x) - 1) (sin (x) + 1)

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

Resolver cada parte separadamente

2 cos (x) - 1 = 0 or sin (x) + 1 = 0

2 cos (x) - 1 = 0 : x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

2 cos (x) - 1 = 0

Mova

1

para o lado direito

2 cos (x) - 1 = 0

Adicionar

1

a ambos os lados

2 cos (x) - 1 + 1 = 0 + 1

Simplificar

2 cos (x) = 1

2 cos (x) = 1

Dividir ambos os lados por

2

2 cos (x) = 1

Dividir ambos os lados por

2

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

Simplificar

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

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

Soluções gerais para

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

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}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

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

sin (x) + 1 = 0 : x = \frac{3 π}{2} + 2 πn

sin (x) + 1 = 0

Mova

1

para o lado direito

sin (x) + 1 = 0

Subtrair

1

de ambos os lados

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

Simplificar

sin (x) = - 1

sin (x) = - 1

Soluções gerais para

sin (x) = - 1

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}

x = \frac{3 π}{2} + 2 πn

x = \frac{3 π}{2} + 2 πn

Combinar toda as soluções

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