$2xy+7x^2y^3;\:x=-2;\:y=-1$
$\left(a^2x+by^2\right)^2\:$
$2a^3bc^2+3a$
$0.008\cdot0.008$
$-x^2-10x$
$y'=2t\:cos^2\:y$
$y+5=x^2-2x+1$
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