$4x+2y=10$
$x^4+6x^3+3x+140$
$\left(5a^2\right)\left(3bc^3\right)\left(2ac^2\right)$
$21-+-42$
$\lim_{x\to\infty}\left(\left(x^2+1\right)\sin\left(\frac{1}{x}\right)\right)$
$sin\left(r-\frac{\pi}{4}\right)$
$\frac{d^5}{dx^5}\left(4x^3+10x^2-5x+4\right)$
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