$\sec\left(2a\right)-\tan\left(2a\right)$
$\left(2+2t\right)^2$
$10a^2+5a+15a^3$
$-u+6v+17w+2c-3v-u-9w$
$8x^3y^2\cdot3x^2y^2$
$x^4+6x^3+3x+140$
$1350+560$
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