$\lim_{x\to-9}\frac{x^2-81}{-9-x}$
$-4+1\le25$
$-x^2-x+6>0$
$\int_1^{\infty}x\sin\frac{1}{x}dx$
$\int\frac{y^2}{\left(25-y^2\right)^{\frac{3}{2}}}dy$
$43.543+0.34+2.7$
$5x^2+6x-9x^2+8x-x+x^2$
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