Posted by manpreet on Tuesday, November 27, 2012 at 5:59am.
if cosx=1/2,x lies in third quadrant, find sinx.

maths  drwls, Tuesday, November 27, 2012 at 6:04am
x is 60 degrees past 180, or 240 degrees. That is 2pi/3 in radians.
The sine of x is sqrt3/2