$7y^2+2y-5$
$\lim_{x\to0}\left(\frac{5x^3+8x^2}{3x^4-2x^2}\right)$
$2+4<2$
$2x+5=x+2$
$\lim_{x\to0}\left(\frac{lnx}{x^a}\right)$
$\left(-3+4\right)^2-10$
$\sin^4a-cos^4a$
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