$\cos\left(x\right)=\frac{2\sin\left(x\right)}{\sec\left(x\right)}$
$x\left(\frac{-\sin\left(x\right)-x\cos\left(x\right)}{3x^2}\right)+\frac{\sin\left(x\right)}{3x}$
$6x^{2}y-8x^{3}y$
$4x^{-3}y^3\cdot2y$
$\frac{15p^{-4}q^{-6}}{-20p^{-12}q^{-3}}$
$603\cdot178$
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