$f\left(x\right)=l\left(ln\:cos\left(2x\right)\:\right)$
$1.4\cdot8$
$\int\frac{\sqrt{x^2+121}}{x}dx$
$\left(9x^3y^2-3x^4\right)^2$
$\frac{4}{8}xy-\frac{1}{6}xy$
$12a+24$
$x^2-9^2$
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