Cos 600 degrees solved by double angle formula (20 points)
show work please :)))

Step-by-step explanation:

we would like to solve the following using double-angle formula:

there're 4 double Angle formulas of cos function which are given by:

since the question doesn't allude which one we need to utilize utilize so I would like to apply the second one, therefore

step-1: assign variables

to do so rewrite the given function:

so,

Step-2: substitute:

recall unit circle thus cos300 is ½:

simplify square:

reduce fraction:

simplify substraction and hence,

the answer i think is a)

step-by-step explanation:

32

step-by-step explanation: