who is correct and how do you find out the answer?
no, i am looking for sin(1), i know sin=1 is Pi/2 and sin(pi)=0.
4 Answers

No one is correct. sin(1) (in radians) and sin(1°) cannot be expressed in terms of π, but the latter can be expressed in terms of very nasty radicals. See this link:
http://www.efnetmath.org/Meta/sine1.htm
Do you happen to mean arcsin(1)? If so, then the answer is π/2 since the solution to:
sin(x) = 1,
in the interval [π/2, π/2] is x = π/2.
I hope this helps!

You must be looking for the radian for sin of 1 and that is pi/2. When the sin = 1, then cosine is zero, then you are at 90 degrees. 90 degrees is half of 180 degrees, the measure for radians, thus when sin=1 you are at half pi in radians. Answer: pi/2.

Check out your unit circle. I'm pretty sure it's pi/2
🙂

square root of 3