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Popular Trigonometria >

sin(10)=2sin(a)cos(a)

Solução

sin (1 0^{\circ}) = 2 sin (a) cos (a)

Solução

a = 5^{\circ} + 18 0^{\circ} n, a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

Radianos

a = \frac{π}{36} + πn, a = \frac{π}{2} - \frac{π}{36} + πn

Passos da solução

sin (1 0^{\circ}) = 2 sin (a) cos (a)

Subtrair

2 sin (a) cos (a)

de ambos os lados

sin (1 0^{\circ}) - 2 sin (a) cos (a) = 0

Reeecreva usando identidades trigonométricas

sin (1 0^{\circ}) - 2 sin (a) cos (a)

Utilizar a identidade trigonométrica do arco duplo:

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

= sin (1 0^{\circ}) - sin (2 a)

sin (1 0^{\circ}) - sin (2 a) = 0

Mova

sin (1 0^{\circ})

para o lado direito

sin (1 0^{\circ}) - sin (2 a) = 0

Subtrair

sin (1 0^{\circ})

de ambos os lados

sin (1 0^{\circ}) - sin (2 a) - sin (1 0^{\circ}) = 0 - sin (1 0^{\circ})

Simplificar

- sin (2 a) = - sin (1 0^{\circ})

- sin (2 a) = - sin (1 0^{\circ})

Dividir ambos os lados por

- 1

- sin (2 a) = - sin (1 0^{\circ})

Dividir ambos os lados por

- 1

\frac{- sin ( 2 a )}{- 1} = \frac{- sin ( 1 0 ^{\circ} )}{- 1}

Simplificar

\frac{- sin ( 2 a )}{- 1} = \frac{- sin ( 1 0 ^{\circ} )}{- 1}

Simplificar

\frac{- sin ( 2 a )}{- 1} : sin (2 a)

\frac{- sin ( 2 a )}{- 1}

Aplicar as propriedades das frações:

\frac{- a}{- b} = \frac{a}{b}

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

Aplicar a regra

\frac{a}{1} = a

= sin (2 a)

Simplificar

\frac{- sin ( 1 0 ^{\circ} )}{- 1} : sin (1 0^{\circ})

\frac{- sin ( 1 0 ^{\circ} )}{- 1}

Aplicar as propriedades das frações:

\frac{- a}{- b} = \frac{a}{b}

= \frac{sin ( 1 0 ^{\circ} )}{1}

Aplicar as propriedades das frações:

\frac{a}{1} = a

= sin (1 0^{\circ})

sin (2 a) = sin (1 0^{\circ})

sin (2 a) = sin (1 0^{\circ})

sin (2 a) = sin (1 0^{\circ})

Aplique as propriedades trigonométricas inversas

sin (2 a) = sin (1 0^{\circ})

Soluções gerais para

sin (2 a) = sin (1 0^{\circ})

sin (x) = a \Rightarrow x = arcsin (a) + 36 0^{\circ} n, x = 18 0^{\circ} - arcsin (a) + 36 0^{\circ} n

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n, 2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n, 2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

Resolver

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n : a = 5^{\circ} + 18 0^{\circ} n

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

Dividir ambos os lados por

2

2 a = arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

Dividir ambos os lados por

2

\frac{2 a}{2} = \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

Simplificar

\frac{2 a}{2} = \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

Simplificar

\frac{2 a}{2} : a

\frac{2 a}{2}

Dividir:

\frac{2}{2} = 1

= a

Simplificar

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2} : 5^{\circ} + 18 0^{\circ} n

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} = 5^{\circ}

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2}

arcsin (sin (1 0^{\circ})) = 1 0^{\circ}

arcsin (sin (1 0^{\circ}))

Para

- 9 0^{\circ} \leq a \leq 9 0^{\circ}

a rcs in (s in (x)) = x

- 9 0^{\circ} \leq 1 0^{\circ} \leq 9 0^{\circ}

= 1 0^{\circ}

= \frac{1 0 ^{\circ}}{2}

Aplicar as propriedades das frações:

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

= \frac{18 0 ^{\circ}}{18 \cdot 2}

Multiplicar os números:

18 \cdot 2 = 36

= 5^{\circ}

= 5^{\circ} + \frac{36 0 ^{\circ} n}{2}

\frac{36 0 ^{\circ} n}{2} = 18 0^{\circ} n

\frac{36 0 ^{\circ} n}{2}

Dividir:

\frac{2}{2} = 1

= 18 0^{\circ} n

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

a = 5^{\circ} + 18 0^{\circ} n

a = 5^{\circ} + 18 0^{\circ} n

a = 5^{\circ} + 18 0^{\circ} n

Resolver

2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n : a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

Dividir ambos os lados por

2

2 a = 18 0^{\circ} - arcsin (sin (1 0^{\circ})) + 36 0^{\circ} n

Dividir ambos os lados por

2

\frac{2 a}{2} = 9 0^{\circ} - \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

Simplificar

\frac{2 a}{2} = 9 0^{\circ} - \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

Simplificar

\frac{2 a}{2} : a

\frac{2 a}{2}

Dividir:

\frac{2}{2} = 1

= a

Simplificar

9 0^{\circ} - \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2} : 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

9 0^{\circ} - \frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} + \frac{36 0 ^{\circ} n}{2}

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2} = 5^{\circ}

\frac{arcsin ( sin ( 1 0 ^{\circ} ) )}{2}

arcsin (sin (1 0^{\circ})) = 1 0^{\circ}

arcsin (sin (1 0^{\circ}))

Para

- 9 0^{\circ} \leq a \leq 9 0^{\circ}

a rcs in (s in (x)) = x

- 9 0^{\circ} \leq 1 0^{\circ} \leq 9 0^{\circ}

= 1 0^{\circ}

= \frac{1 0 ^{\circ}}{2}

Aplicar as propriedades das frações:

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

= \frac{18 0 ^{\circ}}{18 \cdot 2}

Multiplicar os números:

18 \cdot 2 = 36

= 5^{\circ}

= 9 0^{\circ} - 5^{\circ} + \frac{36 0 ^{\circ} n}{2}

\frac{36 0 ^{\circ} n}{2} = 18 0^{\circ} n

\frac{36 0 ^{\circ} n}{2}

Dividir:

\frac{2}{2} = 1

= 18 0^{\circ} n

= 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

a = 5^{\circ} + 18 0^{\circ} n, a = 9 0^{\circ} - 5^{\circ} + 18 0^{\circ} n

Gráfico

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