Can someone please help me with this mathematical problem?

Question

Find the exact value of the expression. Show your work.

sin (cos ^-1 (3/5))

Answer: 4/5
but i don't know how to get it.

Answer 1

sin (cos ^-1 (3/5))

Using inverse trigonometric formula,

sin (cos ^-1 (x))=sqrt(1-x^2)

Substitute 3/5 for x

sin (cos ^-1 (3/5))=sqrt(1-(3/5)^2)

                                 =4/5