$\int_{-1}^2\left(-x^2+2x+1\right)dx$
$e+f+e+f+e$
$2t^3+2t^2-4t-3t^3-9t^2-6t+3t^2-5t+3$
$2x+y;\:x=8;\:y=10$
$3x-12y^2$
$64.85+29.38+18.45$
$144 \times 4 ^ { 4 } - 819 ^ { 4 } b ^ { 2 }$
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