$\sin\left(\sin\left(3\right)+\sin\left(5\right)\right)=\cos\left(\cos\left(3\right)-\cos\left(5\right)\right)$
$\left(2.8x^2y+4xy^2-5xy\right)+\left(-1.5x^2y-3.5xy^2+4.2xy\right)$
$4x^3-9x^2+5x+1\cdot x^2-3$
$\left(3+xy^2\right)^3$
$\frac{1}{x^3+5x}$
$-3x+y;\:x=2;\:y=6$
$x^2+18x+1=0$
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