$$\lim_{k\to\infty}\left(k^2sin\left(\frac{1}{k^2}\right)\right)$$

$$144x^4-900y^6$$

$$549m^2-56m+16$$

$$\int\frac{e^{3x}}{1-3e^{3x}}dx$$

$$-5\cdot1-16$$

$$5x^2-10x+4$$

$$\lim_{x\to0}\left(\frac{sinx}{x\left(2x+1\right)}\right)+\left(\frac{tanx}{x\left(2x+1\right)}\right)$$