Question

If sinA = 4/5, then what is the value of A?

Answer 1

sinA = 4/5

A = nπ + (-1)ⁿ sin-¹(4/5)

where n is integer

Answer 2

A can be represented as A=sin⁻1(4/5) =cos⁻1(3/5)=tan⁻1(4/3)≈63°