$\left(15a^2b^2-c^2\right)\left(15a^2b^2+c^2\right)$
$\cos^2a+\cos^2a\cdot\cot^2a$
$\left(10x^3-9xy^5\right)\left(10x^3+9xy^5\right)$
$314+243$
$-9\cdot14$
$\frac{\:1+\:tan^2\left(x\right)}{csc\:\left(x\right)}=sec^2x$
$x^3=-\frac{x}{2}$
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