$2\cos^2\left(a\right)-\sin2\left(a\right)\cdot\csc\left(a\right)=0$
$\left(\frac{45x^5}{9x^3}\right)^4$
$15x^2-44x+21$
$+8+15+16+17$
$5x^2-7x-90=0$
$\frac{2x-3}{x\left(3x-6\right)}-\frac{3x-1}{x-2}$
$y'=1+\frac{1}{x-y}$
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