Question

write the range of cos thita​

Answer 1

we say x = cos−1(1 2). The function f(x) = cosx has all real numbers in its domain, but its range is −1 ≤ cosx ≤ 1. The values of the cosine function are different, depending on whether the angle is in degrees or radians. The function is periodic with periodicity 360 degrees or 2π radians

Answer 2

$1\leqslant cosx \leqslant - 1$