Answer:
x = 90° + 180° × n, for all integers, n
Explanation:
(sin x - 1)(sin x + 1) = 0
sin x = 1 or sin x = -1
The sine function has value 1 at 90° and all coterminal angles.
The sine function has value -1 at 270° and all coterminal angles.
Answer: x = 90° + 180° × n, for all integers, n