$\left(24x+6\right)^3$
$\lim_{x\to1}\frac{5}{2x-1}$
$\cos x=1-\frac{\sin^2x}{1+\cos x}$
$-7x^2-3x^2+y$
$\frac{15}{2u^{3}+6u}+\frac{6}{u^{2}+3}=\frac{-5}{2u}$
$2x-5>3$
$\left(21x+4\right)^2$
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