Question

Will Medal!

cos(a/2) = +/- sqrt (1+cos(a)/2) for all values of a.

A. True
B. False

Answer 1

\[\cos(\frac{ a }{ 2}) = \pm \sqrt{\frac{ 1+cosa }{ 2 }}\]

Answer 2

I think the answer might be true.

Answer 3

Yeah it is true.