$$4x^2+3x^3-4x^2+7x-3.5x-5$$

$$\:\left(36\right)\:.\:\left(25\right)\:=\:\:\:\:\:\:\:\:\:\:\:\:\:\:$$

$$\frac{1}{sin\left(x\right)}+\frac{1}{csc\left(x\right)+1}=1$$

$$8x+14x^3$$

$$2\sec\left(x\right)-8$$

$$\lim_{x\to\infty}\left(\frac{x\cdot sen\left(x\right)+2}{x^2sen\left(x\right)+x}\right)$$

$$\left(-3\right)^{4\:}+\left(4\right)^4$$