$\int\ln\left(x^2+1\right)dx$

$+12\:+\:-2\:-\:+7\:-\:+31\:+\:+71$

$\sin\left(-\frac{7}{25}\right)\left(\frac{24}{25}\right)$

$2\sin\left(x\right)\cos\left(x\right)\left(\cos\left(x\right)^2-\sin\left(x\right)^2\right)$

$\ln\left(x^6\sqrt{6-x}\right)$

$10d^{2}-24d+9$

$\left(2xy\right)dx+\left(x^2y^2\right)dy=0$