$x\sin\left(x\right)-x^2=0$
$\frac{x^2-4}{x^2+4}$
$\left(5x+y^2\right)^2$
$\int x\left(e^{2x}\cos\left(3x\right)\right)dx$
$8x+4^2$
$\int\left(3x^2+2x\right)\ln\left(x+1\right)dx$
$2cos\left(6t+120\right)+4sen\left(6t-60\right)$
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