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i got 5/4 but thats not one of the choices. do you see where i went wrong?

Hrm. Ok. Uhhh what are all the choices?

sqrt 3/5, sqrt 13/4, 3/5, 4/5

it's sqrt 13/4

alternative way:
sin^2 x + cos^2 x = 1

Woops for the first equation it should be sqrt3, not sqrt 13

lol and it should be 13=x^2, not 13=x. I hate the equation thing.

lol so what i did was correct right?

So the final answer you got SHOULD be \[\sin=\sqrt{13}/4\]

ughh didnt see that, thanks lol !