$$3-x\:\frac{dy}{dx}=8$$

$$-5\sin\left(3x\right)\sin\left(9x\right)$$

$$\lim_{x\to0\:}\log tan\:x^{\tan\left(2x\right)}$$

$$\frac{\left(\tan\left(b\right)\sec\left(b\right)\right)\left(\tan\left(b\right)-\sec\left(b\right)\right)}{sec\:\left(b\right)}$$

$$5+-10-100$$

$$8-x\le5x+32$$

$$\int sen\:\left(7-5w\right)dw$$