$cos170cos50+sin170sin50$
$\int x^{13}\sqrt{x^7}+3dx$
$-5,87+48,73-5,4+98,75$
$\left(cot^2\left(x\right)+1\right)\left(tan\left(x\right)\right)$
$14-5\cdot9$
$18\:-x;\:x=6$
$\left(x+2y-1\right)dx+\left(2x+4y-3\right)dy=0$
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