Question

what measure of degree is this equal to:

Answer 1

\[\cos^{-1} =\frac{ \sqrt{-3} }{ 2 }\]

Answer 2

are u sure, the negative sign in sqrt ?

Answer 3

in or infront of squareroot?

Answer 4

woops. in front.

Answer 5

andf you just pointed out my mistake, i got it now :) thanks

Answer 6

well. it is very familiar angle in trigono
cosine would be - 1/2 sqrt(3) when the measurement angle be
150 degrees and 210 degrees (they are in the 2nd and the 3rd quadrant)