$$7x^2+21x+7$$

$$12y^2+4y^2-4y^2$$

$$5\left(3x-1\right)-20<2\left(3x+1\right)$$

$$4y^2-56y+196$$

$$tan\left(x\right)+cot\left(x\right)+sec\left(x\right)$$

$$5\int\sin\left(\ln\left(3x\right)\right)dx$$

$$\frac{3x^2+5}{2x-4}$$