$\lim_{x\to\infty}\left(\frac{sen\left(\frac{a}{x}\right)}{\frac{1}{x}}\right)$

$7,93\cdot0,5$

$\lim_{t\to0}\left(\frac{5sin\left(9t^4\right)}{3t}\right)$

$2\sin\left(x\right)=-1.36$

$10^{x-3y}=3$

$\int\left(-sin\left(\pi x\right)\right)dx$

$\frac{dy}{dx}=cos\left(x\right)\left(2-y\right)$