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Popular Trigonometria >

sin(x+pi/4)=sqrt(2)cos(x)

Solução

sin (x + \frac{π}{4}) = 2 cos (x)

Solução

x = \frac{π}{4} + πn

Graus

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

Passos da solução

sin (x + \frac{π}{4}) = 2 cos (x)

Reeecreva usando identidades trigonométricas

sin (x + \frac{π}{4}) = 2 cos (x)

Reeecreva usando identidades trigonométricas

sin (x + \frac{π}{4})

Use a identidade de soma de ângulos:

sin (s + t) = sin (s) cos (t) + cos (s) sin (t)

= sin (x) cos (\frac{π}{4}) + cos (x) sin (\frac{π}{4})

Simplificar

sin (x) cos (\frac{π}{4}) + cos (x) sin (\frac{π}{4}) : \frac{2 sin ( x ) + 2 cos ( x )}{2}

sin (x) cos (\frac{π}{4}) + cos (x) sin (\frac{π}{4})

sin (x) cos (\frac{π}{4}) = \frac{2 sin ( x )}{2}

sin (x) cos (\frac{π}{4})

Simplificar

cos (\frac{π}{4}) : \frac{2}{2}

cos (\frac{π}{4})

Utilizar a seguinte identidade trivial:

cos (\frac{π}{4}) = \frac{2}{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}

= \frac{2}{2}

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

Multiplicar frações:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

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

cos (x) sin (\frac{π}{4}) = \frac{2 cos ( x )}{2}

cos (x) sin (\frac{π}{4})

Simplificar

sin (\frac{π}{4}) : \frac{2}{2}

sin (\frac{π}{4})

Utilizar a seguinte identidade trivial:

sin (\frac{π}{4}) = \frac{2}{2}

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}

= \frac{2}{2}

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

Multiplicar frações:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

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

= \frac{2 sin ( x )}{2} + \frac{2 cos ( x )}{2}

Aplicar a regra

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{2 sin ( x ) + 2 cos ( x )}{2}

= \frac{2 sin ( x ) + 2 cos ( x )}{2}

\frac{2 sin ( x ) + 2 cos ( x )}{2} = 2 cos (x)

Simplificar

\frac{2 sin ( x ) + 2 cos ( x )}{2} : \frac{sin ( x ) + cos ( x )}{2}

\frac{2 sin ( x ) + 2 cos ( x )}{2}

Fatorar o termo comum

2

= \frac{2 ( sin ( x ) + cos ( x ) )}{2}

Cancelar

\frac{2 ( sin ( x ) + cos ( x ) )}{2} : \frac{sin ( x ) + cos ( x )}{2}

\frac{2 ( sin ( x ) + cos ( x ) )}{2}

Aplicar as propriedades dos radicais:

n a = a^{\frac{1}{n}}

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

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

Aplicar as propriedades dos expoentes:

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

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

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

Subtrair:

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

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

Aplicar as propriedades dos radicais:

a^{\frac{1}{n}} = n a

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

= \frac{sin ( x ) + cos ( x )}{2}

= \frac{sin ( x ) + cos ( x )}{2}

\frac{sin ( x ) + cos ( x )}{2} = 2 cos (x)

\frac{sin ( x ) + cos ( x )}{2} = 2 cos (x)

Subtrair

2 cos (x)

de ambos os lados

\frac{sin ( x ) - cos ( x )}{2} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

sin (x) - cos (x) = 0

Reeecreva usando identidades trigonométricas

sin (x) - cos (x) = 0

Dividir ambos os lados por

cos (x), cos (x) \neq = 0

\frac{sin ( x ) - cos ( x )}{cos ( x )} = \frac{0}{cos ( x )}

Simplificar

\frac{sin ( x )}{cos ( x )} - 1 = 0

Utilizar a Identidade Básica da Trigonometria:

\frac{sin ( x )}{cos ( x )} = tan (x)

tan (x) - 1 = 0

tan (x) - 1 = 0

Mova

1

para o lado direito

tan (x) - 1 = 0

Adicionar

1

a ambos os lados

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

Simplificar

tan (x) = 1

tan (x) = 1

Soluções gerais para

tan (x) = 1

tan (x)

tabela de periodicidade com ciclo de

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} tan (x) 0 \frac{3}{3} 13 \pm \infty - 3 - 1 - \frac{3}{3}

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

Gráfico

Exemplos populares

5cos(2x)-cos(x)+3=0

5 cos (2 x) - cos (x) + 3 = 0

4tan^2(θ)=12,0<= θ<2pi

4 tan^{2} (θ) = 12, 0 \leq θ < 2 π

(1+tanh(x))/(1-tanh(x))=2

\frac{1 + tanh ( x )}{1 - tanh ( x )} = 2

sin(2x)-sin(x)=0,-pi<= x<= pi

sin (2 x) - sin (x) = 0, - π \leq x \leq π

2(tan(x)+3)=5+tan(x)

2 (tan (x) + 3) = 5 + tan (x)