Question

please what is the answer to this f math question......1-cos^2X=0 for 0°less dan equals X..then X less dan equals 270

Answer 1

1 - cos^2 x = 0 , for 0 ≤ x ≤ 270°

cos^2 x = 1
cos x = ± 1

now look at the cosine curve.
Where is the y equal to either +1 or -1 within your domain ?

Answer 2

1 - cos ^ 2 x = sin ^ 2 x

1 - cos ^ 2 x = 0 mean:

sin ^ 2 x = 0

take square root of both sides:

sin x = 0

On interval 0 ≤ x ≤ 270°

sin x = 0 only for x = 0

Answer 3

Correction.

On interval 0 ≤ x ≤ 270°

sin x = 0 only for x = 0 and x = 180°