Question

1+cos square theta= what

Answer 1

We know (1+cos2a)/2 =cos square a
Therefore add 1 to both side we get
1+cos square a = 1/2+1+(cos2a)/2
Hence 1+cos square a= 3/2+cos 2a

Answer 2

Answer:1+cos²∅=sin²∅ {trigonometric identity}