$\lim_{x\to0}x^2\sin\left(\frac{1}{4x^2}\right)$

$\frac{2x^4-3x^2}{5x^2}$

$\int4\cdot\sec\left(x\right)^5\cdot\tan\left(x\right)dx$

$\sqrt{2025}$

$\lim_{x\to27}\left(\frac{27-x}{\sqrt[3]{x}-3}\right)$

$\int\frac{27x^3}{\sqrt{x^2+1}}dx$

$\frac{\left(1-3x^2\right)}{\left(1-3x^2\right)^{\frac{1}{4}}}$