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- \int \sin{\left(x \right)} \cos{\left(x \right)}\, dx
Find an antiderivative.
- u = \cos{\left(x \right)},\quad du = - \sin{\left(x \right)}\, dx
Substitute u = \cos{\left(x \right)}.
- \int \sin{\left(x \right)} \cos{\left(x \right)}\, dx = \int - u\, d_u
Rewrite the integral in terms of u.
- \int - u\, d_u = -1 \int u\, d_u
Pull the constant -1 out of the integral.
- \int u\, d_u = \frac{u^{2}}{2}
Power rule: ∫xⁿ dx = xⁿ⁺¹/(n+1) (n ≠ −1).
- = - \frac{\cos^{2}{\left(x \right)}}{2}
Substitute back u = \cos{\left(x \right)}.
- 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