$\cos2x-5\cos x+3$
$v-0.20v$
$\frac{6y}{6xy+2y}$
$-6+\left(-4\right)\cdot2+4$
$\cos\left(a\right)\left(\tan\left(a\right)\cot\left(a\right)\right)=\csc\left(a\right)$
$ax+ay+x+y$
$\sec\left(x\right)-\sin\left(x\right)\tan\left(x\right)\csc^2\left(x\right)$
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