Answer:
Below in bold.
Step-by-step explanation:
We have a right triangle here with the hypotenuse = 2 and the legs are 1 and √3.
If tan A > 0 then the opposite side to < A in the triangle is greater than the adjacent so the leg opposite angle A is √3 and the adjacent side = 1.
So cos A = adj/hyp = 1/2.
