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Popular Trigonometria >

(1-cos(a))(1+cos(a))=tan(a)sin(a)

Solução

(1 - cos (a)) (1 + cos (a)) = tan (a) sin (a)

Solução

a = 2 πn, a = π + 2 πn

Graus

a = 0^{\circ} + 36 0^{\circ} n, a = 18 0^{\circ} + 36 0^{\circ} n

Passos da solução

(1 - cos (a)) (1 + cos (a)) = tan (a) sin (a)

Subtrair

tan (a) sin (a)

de ambos os lados

(1 - cos (a)) (1 + cos (a)) - tan (a) sin (a) = 0

Reeecreva usando identidades trigonométricas

(1 + cos (a)) (1 - cos (a)) - sin (a) tan (a)

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

1 - cos (a)

Multiplicar

\frac{1 + cos ( a )}{1 + cos ( a )}

por

Eq u a t i o n 1

= \frac{( 1 - cos ( a ) ) ( 1 + cos ( a ) )}{1 + cos ( a )}

Aplicar a regra da diferença de quadrados:

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

(1 - cos (a)) (1 + cos (a)) = 1 - cos^{2} (a)

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

Utilizar a identidade trigonométrica pitagórica:

1 = cos^{2} (a) + sin^{2} (a)

1 - cos^{2} (a) = sin^{2} (a)

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

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

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

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

Multiplicar frações:

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

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

Eliminar o fator comum:

1 + cos (a)

= sin^{2} (a)

= sin^{2} (a) - sin (a) tan (a)

sin^{2} (a) - sin (a) tan (a) = 0

Fatorar

sin^{2} (a) - sin (a) tan (a) : sin (a) (sin (a) - tan (a))

sin^{2} (a) - sin (a) tan (a)

Aplicar as propriedades dos expoentes:

a^{b + c} = a^{b} a^{c}

sin^{2} (a) = sin (a) sin (a)

= sin (a) sin (a) - sin (a) tan (a)

Fatorar o termo comum

sin (a)

= sin (a) (sin (a) - tan (a))

sin (a) (sin (a) - tan (a)) = 0

Resolver cada parte separadamente

sin (a) = 0 or sin (a) - tan (a) = 0

sin (a) = 0 : a = 2 πn, a = π + 2 πn

sin (a) = 0

Soluções gerais para

sin (a) = 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}

a = 0 + 2 πn, a = π + 2 πn

a = 0 + 2 πn, a = π + 2 πn

Resolver

a = 0 + 2 πn : a = 2 πn

a = 0 + 2 πn

0 + 2 πn = 2 πn

a = 2 πn

a = 2 πn, a = π + 2 πn

sin (a) - tan (a) = 0 : a = 2 πn, a = π + 2 πn

sin (a) - tan (a) = 0

Expresar com seno, cosseno

sin (a) - tan (a)

Utilizar a Identidade Básica da Trigonometria:

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

= sin (a) - \frac{sin ( a )}{cos ( a )}

Simplificar

sin (a) - \frac{sin ( a )}{cos ( a )} : \frac{sin ( a ) cos ( a ) - sin ( a )}{cos ( a )}

sin (a) - \frac{sin ( a )}{cos ( a )}

Converter para fração:

sin (a) = \frac{sin ( a ) cos ( a )}{cos ( a )}

= \frac{sin ( a ) cos ( a )}{cos ( a )} - \frac{sin ( a )}{cos ( a )}

Já que os denominadores são iguais, combinar as frações:

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

= \frac{sin ( a ) cos ( a ) - sin ( a )}{cos ( a )}

= \frac{sin ( a ) cos ( a ) - sin ( a )}{cos ( a )}

\frac{- sin ( a ) + cos ( a ) sin ( a )}{cos ( a )} = 0

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

- sin (a) + cos (a) sin (a) = 0

Fatorar

- sin (a) + cos (a) sin (a) : sin (a) (cos (a) - 1)

- sin (a) + cos (a) sin (a)

Fatorar o termo comum

sin (a)

= sin (a) (- 1 + cos (a))

sin (a) (cos (a) - 1) = 0

Resolver cada parte separadamente

sin (a) = 0 or cos (a) - 1 = 0

sin (a) = 0 : a = 2 πn, a = π + 2 πn

sin (a) = 0

Soluções gerais para

sin (a) = 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}

a = 0 + 2 πn, a = π + 2 πn

a = 0 + 2 πn, a = π + 2 πn

Resolver

a = 0 + 2 πn : a = 2 πn

a = 0 + 2 πn

0 + 2 πn = 2 πn

a = 2 πn

a = 2 πn, a = π + 2 πn

cos (a) - 1 = 0 : a = 2 πn

cos (a) - 1 = 0

Mova

1

para o lado direito

cos (a) - 1 = 0

Adicionar

1

a ambos os lados

cos (a) - 1 + 1 = 0 + 1

Simplificar

cos (a) = 1

cos (a) = 1

Soluções gerais para

cos (a) = 1

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}

a = 0 + 2 πn

a = 0 + 2 πn

Resolver

a = 0 + 2 πn : a = 2 πn

a = 0 + 2 πn

0 + 2 πn = 2 πn

a = 2 πn

a = 2 πn

Combinar toda as soluções

a = 2 πn, a = π + 2 πn

Combinar toda as soluções

a = 2 πn, a = π + 2 πn

Gráfico

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