if cosx = 12/13 and x is a quadrant I angle. Find the value of sinx

Answer 1

make a sketch of the triangle

since cos x = 12/13, the adjacent is 12, the hypotenuse is 13 and by Pythagoras, the opposite side is 5
( 5^2 + 12^2 = 13^2 )

sin x = 5/13