Question

Let cos p =.22. Which of the following is cos p/2

Answer 1

half angle formula

Answer 2

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

Answer 3

given an abc right triangle:

\[cos(\frac{x}{2}) =\frac{ a}{\sqrt{2c(c-b)}}\]

Answer 4

oooh what is that?

Answer 5

thats just something a determined the other day :)

Answer 6

where is the \(x\) in it? i mean which angle is it?

Answer 7

any angle

Answer 8

i cant figure it out. i suck at trig :(

Answer 9

in this case; a=sqrt(1-b^2)