Question

Question #289b5

Answer 1

From the diagram below:
`sin(225^o) = -1/sqrt(2)` `color(white)("XXXX")` `cos(225^o)=-1/sqrt(2)` `color(white)("XXXX")` `tan(225^o) = 1`

Explanation:

`225^o = 180^o + 45^o`

So `225^o` is in the `3^(rd)` quadrant with a reference angle of `45^o`

We can read the three basic trigonometric functions directly from this diagram using their basic definitions.