$$40\cdot0.08$$

$$9x^2-25a^2$$

$$y^{'\:}=e\frac{e^{-x}}{seny};\:y\left(1\right)=0$$

$$\lim_{x\to\infty}\left(6^x+2\right)$$

$$\left(13y+25\right)-\left(8y+5\right)$$

$$\frac{\left(2-5x\right)}{\left(2+2x\right)}$$

$$\tan\left(x\right)-\frac{1}{\cos^2x}-1$$