$\left[4h^7k^2\right]^4$
$\int\frac{3}{1+\sqrt{x}}dx$
$\left(a^{x+1}-2b^{x-1}\right)\left(a^{x-1}-2b^{x+1}\right)$
$2x-14$
$\lim_{x\to\infty}\:\frac{3^x-2^x}{4^x}$
$\int\frac{y^3}{\sqrt{25-y^2}}dy$
$\left(8x^3-3x^2\right)^2$
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