SOLUTION: Show how they equal. cos 90 degrees= square root 1 + cos 180 degrees/ 2 PLEASE HELP ME OUT

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Question 181072: Show how they equal.
cos 90 degrees= square root 1 + cos 180 degrees/ 2
PLEASE HELP ME OUT

Answer by eperette(173) About Me  (Show Source):
You can put this solution on YOUR website!
THINGS YOU MUST KNOW
cos90=0
cos180=-1
cos90= sqr(1 + cos180)/2
0 = sqr (1 + (-1))/2
0 = sqr (0)/2
0= 0/2
0=0