$\left(3b^7a\right)\left(2a^2b^{-5}\right)$
$2a^2-3b+a^2+6a$
$a=\tan\left(x\right).\cos\left(x\right).\csc\left(x\right)$
$\left(-x^4+8x^2+9\right)^2$
$\tan\left(x-\frac{3\pi}{4}\right)=\frac{-\sin\left(x\right)-\cos\left(x\right)}{-\cos\left(x\right)+\sin\left(x\right)}$
$\left(3\:senx\:+\:2\:cos\:x\right)^2\:+\:\left(2\:sen\:x\:-\:3\:cos\:x\right)^2$
$cos\left(6x\right)\cdot\:cos\left(2x\right)+cos\left(6x\right)\cdot\:cos\left(2x\right)$
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