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

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

myininaya · Answer

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

anonymous · Answer

yes it does

myininaya · Answer

|dw:1336943486185:dw|

So can you label this triangle with the info given
$$\sin(\theta)=\frac{-4}{5}$$

myininaya · Answer

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

myininaya · Answer

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

anonymous · Answer

ohhhhhhh it is that simple....hah i think i over analyzed it...thanks will do|dw:1336943601502:dw|