$\lim_{x\to i}\left(\frac{3x^4-2x^3+8x^2-2x+5}{x-i}\right)$
$1.9+1.2$
$\left(-5x+3x^4+3-4x^2\right)+\left(-x^3-x+x^2+1\right)$
$-12\cdot9$
$x^2-10x\:-11$
$4x^6-16x^3+16$
$\frac{dy}{dx}\left(sec^2\left(x\:\right)+\csc\:\left(y\right)\right)$
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