$sec\:\left(x\right)^2\:-\:cos\:\left(x\right)^2\left(sec\left(x\right)^2\right)$
$8x\:-\:x\:+\:3x$
$\left(7+5xy\right)\left(7-5xy\right)$
$\left(6a^3+b^2\right)\sqrt{36a^6+8ab^4+36}$
$2\pi rh+2\pi r^2$
$20a-9a$
$6x^2-23x-20$
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