What is the best way to solve this system of nonlinear equation? Is there any closed form solution?

[safe pawn]

so what i think is that mod os sin x = sin (mod of x)

ǀ sin x ǀ = sin (ǀxǀ)

[tender perch]

ǀ sin x ǀ != sin (ǀxǀ)

[safe pawn]

for the interval

given

that i know that they r different

but in the gven interval they are same

[tender perch]

Ah, sr, that's right