How do you find cos if sin= 5/13?
By Pythagorean Theorem
However, we need to note that if the angle is in Quadrant II then the
(the angle can't be in Q III or Q IV, since
sin x > 0 --> x is either in Quadrant 1 or Quadrant 2.
If x is in Quadrant 1, then, cos x > 0 -->
If x is in Quadrant 2, then, cos < 0 -->