$6x-8y=-10$
$\frac{\sin\left(2x\right)}{2\cos\left(x\right)}=\frac{\sqrt{2}}{2}$
$a2-4$
$18\cdot19$
$\lim_{x,y\to0,0}\left(\frac{sin\left(xy\right)}{y}\right)$
$\frac{cos^2x-sin^2x}{cos^2}$
$\int\frac{x+1}{3x^2+6x-3}dx$
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