$\lim_{x\to\infty}\frac{4x}{2x^2+1}$
$\frac{\sin\left(9x\right)-\sin\left(3x\right)}{\cos\left(9x\right)+cos\left(3x\right)}$
$-4-49$
$\frac{8y^8}{4y^5}$
$x^2-x-6<0$
$\int\left(2x+1\right)\left(3x^2+3x\right)^7dx$
$( x ^ { 2 } - y ^ { 2 } ) ^ { 5 }$
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