$$\int\frac{1}{\left(x^2-6x+5\right)}dx$$

$$\left(t-2\right)\left(t-4\right)$$

$$x^2-4-117$$

$$\cos\left(20\right)-\cos\left(40\right)=0$$

$$35.245+23.65$$

$$\frac{a^6.\left(a^2\right)^3.\left(a^4\right)^2}{a.a^3.\left(a^2\right)^3}$$

$$\frac{3^6.2^5.5^2}{9^3.4^3.5}$$