$x^2-2x+\frac{3}{x}-1$
$3x^5.\:2x$
$15x^2+4x-3$
$2xin\left(3x\right)sin\left(x\right)=1$
$\frac{7-7cos^2x}{sin^2x}$
$\int t\cdot sin\left(nt\right)dt$
$\frac{xy}{a}-1$
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