$\int_0^{\frac{\pi}{2}}\left(9cos\left(10x\right)cos\left(11x\right)\right)dx$
$-12+\left(-4\right)\cdot3$
$2sinxcos^3x+2sin^3xcosx=sin2x$
$-65+4-9+86-54-6+5-45$
$5\cdot2-3\cdot\left(4-1\right)$
$\frac{x^3y^{-2}}{z^2}$
$\frac{\left(1-\cos\left(x\right)^2\right)\left(1+\cot\left(x\right)^2\right)}{\cos\left(x\right)}=\sec\left(x\right)$
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