$$5x+41=10x+66$$

$$\sin\left(y\right)^2+\sin\left(y\right)=0$$

$$\lim_{n\to\infty}\left(\left|\frac{\left(n+1\right)^2}{3\left(3n+2\right)\left(3n+1\right)}\right|\right)$$

$$\frac{1+senu}{cosu}=\frac{cosu}{1-senu}$$

$$6\sqrt{2^2+5}$$

$$-16sin4x=0$$

$$\int2e^{5x}dx$$