$3;a=1;c=3;d=\frac{1}{2}$
$4x^3+2x^2-4x$
$\int ye^{-3y}dx$
$\lim_{x\to\infty}\left(\sqrt{7x+4\sqrt{x}}-\sqrt{7x+9\sqrt{x}}\right)$
$\frac{1}{\cot2\theta}+\sec\theta\cos\theta$
$a^2-2ab+b^2-1$
$-6x+2y;\:x=6;\:y=-3$
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