$\cos\left(223.5x\right)\cos\left(-15.5x\right)-\sin\left(223.5x\right)\sin\left(-15.5x\right)$
$3x^2+4x-35=0$
$\frac{243x^{3}+32}{3x+2}$
$\frac{a^2-2a-3}{a+4}$
$-7a=-10-9a$
$\int ctg^3dx$
$\left(x-3\right)\left(x+4\right)\left(x+2\right)$
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