Question

hello can you help me with this plane trigonometry question please and thank you for putting the time for explaining this to me and I thank you for your time and for the question it has to be in exact value because it won't accept decimals

Answer 1

What you need to do is work using radians instead of using degrees.

`\sin ((5\pi)/(3))=-\frac{\sqrt[]{3}}{2}`
`\cos ((5\pi)/(3))=(1)/(2)`

You could write the first one as:

`Cos((5\pi)/(3))=\text{-}(3)^((1/2))/2`