Question

16cos^20=4?

Answer 1

is 0 represent theta ?\[\large\rm 16 \cos^2 \theta =4 \] like this ??
if yes, then solve for cos(theta)

Answer 2

yes

Answer 3

alright it's like simple algebraic equation
solve for cos theta

Answer 4

let cos theta = x
\[\huge\rm 16x^2=4\] now can you solve for x ?