(g o f)(x) = g(f(x)) = (f(x))² + 1 = 2 - cos ²x
(f(x))² + 1 = 2 - cos ²x
(f(x))² = 1 - cos ²x
(f(x))² = sin² x
f(x) = sin x
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(g o f)(x) = g(f(x)) = (f(x))² + 1 = 2 - cos ²x
(f(x))² + 1 = 2 - cos ²x
(f(x))² = 1 - cos ²x
(f(x))² = sin² x
f(x) = sin x
Maka f(270°) = sin 270° = -1