Posted by George on Monday, October 8, 2012 at 4:06pm.
How do you find the exact value of Sin(13pi)?

Trigonomety question  Steve, Monday, October 8, 2012 at 4:20pm
since 13π = 12π + π, it suffices to get the exact value of sin(π).
adding multiples of 2π does not change the value of the sine function.