$\frac{\sec\left(x\right)}{\sin\left(x\right)}-\frac{\sin\left(x\right)}{\cos\left(x\right)}=\frac{\sec\left(x\right)}{\sin\left(x\right)}-\tan\left(x\right)$
$12k+11\left(3k-5\right)$
$3x^6-x^2$
$\left(3x+5y\right)^{2}$
$\frac{2}{5}+\frac{6}{10}$
$\frac{dy}{dx}=4e^{-.8x}-.5y$
$27m^{3}-\frac{1}{3}b^{9}$
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