$\frac{2+\csc\left(30\right)}{\sec\left(30\right)}-2\cos\left(30\right)=\cot\left(30\right)$
$\cos^2+1\cdot\sec^2-1=\sec^2$
$\frac{dx}{dt}=x+2e^t+y^2$
$11+2\cdot1+1$
$2sin\left(x\right)-2=-1$
$x-\frac{x}{2}=2x-6$
$12a^2-5a-2$
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