How to get integral: ∫ sin (T ^ 2) DT ∫ sin (T ^ 2) DT, where is the square of T,

How to get integral: ∫ sin (T ^ 2) DT ∫ sin (T ^ 2) DT, where is the square of T,

Let π / 12 * t = x, then t = 12x / π, then the original formula = ∫ (π ~ 0) 4 / 5sin xdx can be solved now? The answer is 8 / 5 = 1