Question

Suppose `cos theta = 3/5`, what is `sin theta`?

Answer 1

Since cos is the ratio of adjacent / hypotenuse, we have a right triangle with adjacent side of 3 units and hypot of 5.
Use Pythagoras to solve this right triangle for the opposite side.
`3^2 + opp^2 = 5^2`
Opposite =4
Sin theta = opp/hyp. So this will ne 4/5