Question 600696
find the value of sin(arc cos 4/5),express the result as a fraction
sin(arc cos 4/5) reads as follows:
sin of an angle whose cos of the same angle is 4/5 (adjacent/hypotenuse)
You can use the pythagorean theorem to find the opposite side, but you should recognize you are working with a 3-4-5 right triangle, so the opposite side=3
sin(arc cos 4/5) =3/5