Question

How do you find the value for `sin^-1 (3/5)`?

Answer 1

That's the 3/4/5 right triangle, whose non-right angles I believe are transcendental in both degrees and radians. If we need the value exactly, that's vacuously `text{Arc}text{sin}(3/5)`.

For an approximation we use a calculator or computer; I'll leave that to you.