Math — popular questions

Angle in degrees between the hands of a watch; congruence of triangles

$x^{x^7}=5^{(25)^{0.2}}$

14. Si $r=\frac{\sen5\beta+\sen3\beta}{\cos3\beta-\cos5\beta}$

21. 7 \cdot \log_4 u - 3 \cdot \log_4 v^2

36. $x^4-2x^2-63\le 0$

35. $x^4-5x^2+4<0$

34. $\frac{x^2+4x+4}{2x^2-x-1}>0$

28. $\frac{6x-5}{4x+1}<0$

27. $(x-1)(3-x)(x-2)^2>0$

Solve the inequality $\frac{(x-1)^2(x+1)^3}{x^4(x-2)}\le 0$