Question

Trigonometry Hellppp please:

[Given that sin θ= -4/5 with θ in quadrant IV, find cos 2θ.]

--please show me how you got your answer, thank you :D

Answer 1

\[\sin(\theta)=\frac{opp}{hyp} \text{ , right? }\]

Answer 2

yes it does

Answer 3

So can you label this triangle with the info given
\[\sin(\theta)=\frac{-4}{5}\]

Answer 4

I put that triangle in the 4th quadrant because that is where it told me to put it

Answer 5

You can use my picture just click that pencil and label away

Answer 6

ohhhhhhh it is that simple....hah i think i over analyzed it...thanks will do