$\left(7x^2y+a^3b\right)\left(7x^2y-a^3b\right)$
$\int\frac{1}{\sin^2\left(x\right)\cos^4\left(x\right)}dx$
$3\left(-3\right)$
$\sin^2x\csc^2x-\sin^2x$
$-7\:.\:1\:+\:4$
$\frac{1-\tan\:\left(x\right)^2}{\tan\:\left(x\right)}=\cot\:\left(x\right)-\tan\:\left(x\right)$
$3x+17\ge68$
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