$2-\frac{2}{y}=0$
$8x-3=21$
$\cot\:\left(a+45\right)=\frac{\cos\:\left(a\right)-\sin\:\left(a\right)}{\cos\:\left(a\right)+\sin\:\left(a\right)}$
$\int_0^{\sqrt{4-x^2}}\left(y^2x\right)dy$
$y-4+6y+3y+5$
$\int\frac{\log\left(9x\right)}{x}dx$
$\frac{3x^3+x}{x+1}$
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