$5tanb=10$
$\frac{\tan\left(\sqrt{x+x^2}\right)+\sin\left(-x\right)}{4+\cos^2\left(x\right)}$
$4x+3y+3x-2y+2x+3x-2y$
$x^5+4x^4-12x^3-34x^2+11x+30$
$200+75+50+150+20+35$
$5+10-2\cdot\:3$
$x^2+9x+1=0$
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