f(x)=sin(2x)
f(pi/4)=?

Question

f(x)=sin(2x)
f(pi/4)=?

legomyego180 · Answer

https://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Unit_circle_angles_color.svg/2000px-Unit_circle_angles_color.svg.png

hdrager · Answer

I still don't know what to do???

legomyego180 · Answer

You need to have the unit circle memorized to do this problem if you havent already memorized it.

$$f(x)=\sin(2x)$$
$$f(\frac{ \pi }{ 4 })=\sin(2*\frac{ \pi }{ 4 })=\sin(\frac{ 2\pi }{ 4 })=\sin(\frac{ \pi }{ 2 })$$

legomyego180 · Answer

Then take a look at your unit circle... https://www.google.com/search?q=unit+circle&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiz7cjp_cHOAhUN02MKHatPCjsQ_AUICCgB&biw=1440&bih=791#imgrc=7btvgKywl0C4yM%3A Look at the angle $\frac{ \pi }{ 2 }$ and the sin value and you'll see that $\sin(\frac{ \pi }{ 2 })=1$

hdrager · Answer

ohhh alright

legomyego180 · Answer

memorize it asap! I waited forever to memorize it and had to end up retaking trig. It's extremely important

hdrager · Answer

I almost had it memorized last year but I've forgotten over the summer break