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Popular Cálculo >

integral de 5sin^5(x)cos^{-3/2}(x)

Solução

\int 5 sin^{5} (x) cos^{- \frac{3}{2}} (x) d x

Solução

- 2 cos^{\frac{5}{2}} (x) + \frac{20}{9} cos^{\frac{9}{2}} (x) - \frac{10}{13} cos^{\frac{13}{2}} (x) + C

Passos da solução

\int 5 sin^{5} (x) cos^{- \frac{3}{2}} (x) d x

Remover a constante:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 5 \cdot \int sin^{5} (x) cos^{- \frac{3}{2}} (x) d x

- \frac{3}{2} = 3 \cdot \frac{1}{2}

= 5 \cdot \int sin^{5} (x) cos^{3 \cdot \frac{1}{2}} (x) d x

Multiplicar

3 \cdot \frac{1}{2} : \frac{3}{2}

= 5 \cdot \int sin^{5} (x) cos^{\frac{3}{2}} (x) d x

Reeecreva usando identidades trigonométricas

= 5 \cdot \int (1 - cos^{2} (x))^{2} sin (x) cos^{\frac{3}{2}} (x) d x

Aplicar integração por substituição

= 5 \cdot \int - u^{\frac{3}{2}} (1 - u^{2})^{2} d u

Expandir

- u^{\frac{3}{2}} (1 - u^{2})^{2} : - u^{\frac{3}{2}} + 2 u^{\frac{7}{2}} - u^{\frac{11}{2}}

= 5 \cdot \int - u^{\frac{3}{2}} + 2 u^{\frac{7}{2}} - u^{\frac{11}{2}} d u

Aplicar a regra da soma:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 5 (- \int u^{\frac{3}{2}} d u + \int 2 u^{\frac{7}{2}} d u - \int u^{\frac{11}{2}} d u)

\int u^{\frac{3}{2}} d u = \frac{2}{5} u^{\frac{5}{2}}

\int 2 u^{\frac{7}{2}} d u = \frac{4}{9} u^{\frac{9}{2}}

\int u^{\frac{11}{2}} d u = \frac{2}{13} u^{\frac{13}{2}}

= 5 (- \frac{2}{5} u^{\frac{5}{2}} + \frac{4}{9} u^{\frac{9}{2}} - \frac{2}{13} u^{\frac{13}{2}})

Substituir na equação

u = cos (x)

= 5 (- \frac{2}{5} cos^{\frac{5}{2}} (x) + \frac{4}{9} cos^{\frac{9}{2}} (x) - \frac{2}{13} cos^{\frac{13}{2}} (x))

Simplificar

5 (- \frac{2}{5} cos^{\frac{5}{2}} (x) + \frac{4}{9} cos^{\frac{9}{2}} (x) - \frac{2}{13} cos^{\frac{13}{2}} (x)) : - 2 cos^{\frac{5}{2}} (x) + \frac{20}{9} cos^{\frac{9}{2}} (x) - \frac{10}{13} cos^{\frac{13}{2}} (x)

= - 2 cos^{\frac{5}{2}} (x) + \frac{20}{9} cos^{\frac{9}{2}} (x) - \frac{10}{13} cos^{\frac{13}{2}} (x)

Adicionar uma constante à solução

= - 2 cos^{\frac{5}{2}} (x) + \frac{20}{9} cos^{\frac{9}{2}} (x) - \frac{10}{13} cos^{\frac{13}{2}} (x) + C

Gráfico

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