$\left(2y-\frac{3}{2}\right)^2-\left(y-4\right).\left(y+\frac{1}{2}\right)$
$\lim_{x\to3}\left(\frac{x^3}{senx-x}\right)$
$-5x^2+20x-40=0$
$\cos^2+\cos^2\cdot\cot^2$
$b\cdot\left(3t^{2}+4u^{3}\right)^{2}$
$103\left(x-3\right)^2$
$-7x-35$
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