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Popular Trigonometria >

csc^2(x)=4cot^2(x)

Solução

csc^{2} (x) = 4 cot^{2} (x)

Solução

x = \frac{2 π}{3} + 2 πn, x = \frac{4 π}{3} + 2 πn, x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

Graus

x = 12 0^{\circ} + 36 0^{\circ} n, x = 24 0^{\circ} + 36 0^{\circ} n, x = 6 0^{\circ} + 36 0^{\circ} n, x = 30 0^{\circ} + 36 0^{\circ} n

Passos da solução

csc^{2} (x) = 4 cot^{2} (x)

Subtrair

4 cot^{2} (x)

de ambos os lados

csc^{2} (x) - 4 cot^{2} (x) = 0

Fatorar

csc^{2} (x) - 4 cot^{2} (x) : (csc (x) + 2 cot (x)) (csc (x) - 2 cot (x))

csc^{2} (x) - 4 cot^{2} (x)

Reescrever

csc^{2} (x) - 4 cot^{2} (x)

como

csc^{2} (x) - (2 cot (x))^{2}

csc^{2} (x) - 4 cot^{2} (x)

Reescrever

4

como

2^{2}

= csc^{2} (x) - 2^{2} cot^{2} (x)

Aplicar as propriedades dos expoentes:

a^{m} b^{m} = (ab)^{m}

2^{2} cot^{2} (x) = (2 cot (x))^{2}

= csc^{2} (x) - (2 cot (x))^{2}

= csc^{2} (x) - (2 cot (x))^{2}

Aplicar a regra da diferença de quadrados:

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

csc^{2} (x) - (2 cot (x))^{2} = (csc (x) + 2 cot (x)) (csc (x) - 2 cot (x))

= (csc (x) + 2 cot (x)) (csc (x) - 2 cot (x))

(csc (x) + 2 cot (x)) (csc (x) - 2 cot (x)) = 0

Resolver cada parte separadamente

csc (x) + 2 cot (x) = 0 or csc (x) - 2 cot (x) = 0

csc (x) + 2 cot (x) = 0 : x = \frac{2 π}{3} + 2 πn, x = \frac{4 π}{3} + 2 πn

csc (x) + 2 cot (x) = 0

Expresar com seno, cosseno

csc (x) + 2 cot (x)

Utilizar a Identidade Básica da Trigonometria:

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

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

Utilizar a Identidade Básica da Trigonometria:

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

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

Simplificar

\frac{1}{sin ( x )} + 2 \cdot \frac{cos ( x )}{sin ( x )} : \frac{1 + 2 cos ( x )}{sin ( x )}

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

Multiplicar

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

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

Multiplicar frações:

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

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

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

Aplicar a regra

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

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

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

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

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

1 + 2 cos (x) = 0

Mova

1

para o lado direito

1 + 2 cos (x) = 0

Subtrair

1

de ambos os lados

1 + 2 cos (x) - 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{2 π}{3} + 2 πn, x = \frac{4 π}{3} + 2 πn

x = \frac{2 π}{3} + 2 πn, x = \frac{4 π}{3} + 2 πn

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

csc (x) - 2 cot (x) = 0

Expresar com seno, cosseno

csc (x) - 2 cot (x)

Utilizar a Identidade Básica da Trigonometria:

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

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

Utilizar a Identidade Básica da Trigonometria:

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

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

Simplificar

\frac{1}{sin ( x )} - 2 \cdot \frac{cos ( x )}{sin ( x )} : \frac{1 - 2 cos ( x )}{sin ( x )}

\frac{1}{sin ( x )} - 2 \cdot \frac{cos ( x )}{sin ( x )}

Multiplicar

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

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

Multiplicar frações:

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

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

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

Aplicar a regra

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

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

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

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

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

1 - 2 cos (x) = 0

Mova

1

para o lado direito

1 - 2 cos (x) = 0

Subtrair

1

de ambos os lados

1 - 2 cos (x) - 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

Combinar toda as soluções

x = \frac{2 π}{3} + 2 πn, x = \frac{4 π}{3} + 2 πn, x = \frac{π}{3} + 2 πn, x = \frac{5 π}{3} + 2 πn

Gráfico

Exemplos populares

3tan^2(x)-2=5sec^2(x)-9