integral de-4pi a 3pi de cos^2(x)

Solução

\int_{- 4 π}^{3 π} cos^{2} (x) d x

\frac{7 π}{2}

Decimal

10.99557 \dots

Passos da solução

\int_{- 4 π}^{3 π} cos^{2} (x) d x

Reeecreva usando identidades trigonométricas

= \int_{- 4 π}^{3 π} \frac{1 + cos ( 2 x )}{2} d x

Remover a constante:

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

= \frac{1}{2} \cdot \int_{- 4 π}^{3 π} 1 + cos (2 x) d x

Aplicar a regra da soma:

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

= \frac{1}{2} (\int_{- 4 π}^{3 π} 1 d x + \int_{- 4 π}^{3 π} cos (2 x) d x)

\int_{- 4 π}^{3 π} 1 d x = 7 π

\int_{- 4 π}^{3 π} cos (2 x) d x = 0

= \frac{1}{2} (7 π + 0)

Simplificar

\frac{1}{2} (7 π + 0) : \frac{7 π}{2}

= \frac{7 π}{2}

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