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Integrate sin(x)·cos(x)

\int \sin{\left(x \right)} \cos{\left(x \right)}\, dx

Step by step

  1. \int \sin{\left(x \right)} \cos{\left(x \right)}\, dx

    Find an antiderivative.

  2. u = \cos{\left(x \right)},\quad du = - \sin{\left(x \right)}\, dx

    Substitute u = \cos{\left(x \right)}.

  3. \int \sin{\left(x \right)} \cos{\left(x \right)}\, dx = \int - u\, d_u

    Rewrite the integral in terms of u.

  4. \int - u\, d_u = -1 \int u\, d_u

    Pull the constant -1 out of the integral.

  5. \int u\, d_u = \frac{u^{2}}{2}

    Power rule: ∫xⁿ dx = xⁿ⁺¹/(n+1) (n ≠ −1).

  6. = - \frac{\cos^{2}{\left(x \right)}}{2}

    Substitute back u = \cos{\left(x \right)}.

  7. F(x) = - \frac{\cos^{2}{\left(x \right)}}{2} + C

    Add the constant of integration.

Reveal the answer
- \frac{\cos^{2}{\left(x \right)}}{2} + C