The long rectangular side of the solution (1) is b, and the short rectangular side is a. ..

Then b-a= 1/5.

Answer? +b？ = 1

A=3/5 b=4/5 to solve this system of equations.

∴sinθ=3/5 cosθ=4/5

The equivalent relationship between sinθ and cosθ: sinθ=(3/4)cosθ.

tanθ=3/4

(2) Logarithmic (3/4) radix (x x- 1) ≥ 0

∴x^x- 1≥ 1

x^x≥2