$\lim_{x\to\pi}\left(\frac{\sin\left(9x\right)}{\sin\left(3x\right)}\right)$
$\lim_{x\to0}\left(\frac{2x^2-5x+x}{x^a-x^2}\right)$
$12l+220-80l-l^2-242+176l+8l^2$
$x^2-x+90$
$\frac{x^4}{4+4x^2}$
$-64+25y^2=25y^2-64$
$9x^4-34^2+25$
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