$7-7+5x+2+2x^2+2x$
$\cos x=\frac{3}{4}$
$\frac{2x+11}{7}=\frac{3}{x}$
$\int lnx\:lnx\:dx$
$1+tan^2x-sec^2x=0$
$\int xsec^2\left(6x^2\right)dx$
$16\sin^2x-\cos^2x=0$
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