$\lim_{x\to0}\left(\frac{3^x}{2^{x^3}}\right)$
$\left(3x+2x^2+1\right)-\left(2x^2-x\right)$
$-78+41-45+2-59$
$4-1.20$
$\int2yxdy$
$6x^2-9x-15$
$( 3 + y ^ { 2 } ) \cdot ( 3 x - y ^ { 2 } )$
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