$sin\left(6x\right)\:sin\:\left(9x\right)$
$-22-\left(-25\right)-\left(2\right)$
$-\frac{1}{\cos^2\left(x\right)}-\frac{tan^2\left(x\right)}{cos^2\left(x\right)}=-\frac{1}{cos^4}$
$y=\left(3\:+\:4x\:-x^2\right)^{\frac{1}{2}}$
$\frac{\cos x+sin\:x}{cos\:x}-\frac{sin\:x-cos\:\:x}{sin\:x}$
$\lim_{x\to0}\left(\frac{\left(e^{-x}-e^{2x}\right)}{x}\right)$
$9w^2+12w+4$
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