$5cos\:+\:\sqrt{3}=3cos$
$4x^{\frac{1}{2}}-4=0$
$-\left(a+5\right)^2$
$2x^2+4x+3=0$
$\frac{x^4+625}{x-5}$
$5x+5^2+5z$
$y'+\left(3-\frac{1}{x}\right)y=x^2-x$
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