$3\cdot39$
$5x+41=10x+66$
$\int ln\left(9x^2\right)dx$
$sen^2a\:+tan^2a$
$\left(-11\right)\left\{15+\left(-16\right)\right\}\left\{\left(-14\right)-\left(-11\right)\right\}$
$( 3 p ^ { 3 } - 7 q r ^ { 4 } ) ^ { 3 }$
$\frac{2}{5x^2}+1$
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