$\sin\left(2x\right)=\left(\tan\left(x\right)\right)\left(1+\cos\left(2x\right)\right)$

$\left(-2\right)^4+2^4$

$\frac{7x}{2x^2}$

$xsin\left(\frac{y}{x}\right)\frac{dy}{dx}=ysin\left(\frac{y}{x}\right)-x$

$e^{1t}sin\left(3t\right)$

$\cos^3x-sen^3x\left(x\right)^2\cdot\cos\left(x\right)^2$