$\frac{\left(cos^2\left(a\right)\right)}{1-sin\left(a\right)}$
$-18\cdot72$
$\lim_{x\to0}\left(\frac{x^2+8x+9}{lnx}\right)$
$\left(5^2\right)\left(5^{-5}\right)$
$\frac{2x^2-\left(4x^2-6x\right)}{x^4}$
$xy^2=x-8$
$\frac{9}{1-sin\left(a\right)}+\frac{9}{1+sin\left(a\right)}$
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