$0,5x^2-3x-1\cdot0,4x^4-2x^2-7$
$2k^2+k-7=0$
$\lim_{x\to70}\left(\csc\left(x\right)\right)$
$-8+4-15$
$a\left(a+1\right)+b\left(x+1\right)$
$\left(x+1\right)dx+\left(y+1\right)dy=0$
$\frac{1+\cot\left(c\right)}{\csc\left(c\right)}$
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