Question

can anyone explain me this

Answer 1

this r the trigonometric values this cannt  be explain on brainly

Answer 2

THIS IS THE TRINGNOMENTRY RATIO AND THE VALUE OF COS THETA .IN THE ABOVE FIGURE WE HAVE GIVEN RATIO OF COSAND THE TRIANGLE ABC IS RIGHT ANGLE TRIANGLE. B IS THETA ,C =90° AND AB IS HYPOTENUSE, AC IS OPPOSITE SIDE AND BC IS ADJACENT.
COS 0°=1
COS30°=UNDER ROOT 3BY 2
COS45°=1UNDER ROOT 2
COS60°=1/2
COS90°=0
COS180°=-1