sin x ( 1 - cos² x) = 1
sin x ( sin² x) = 1
sin³ x = 1
∛sin³ x = ∛1
sin x = 1
x = 90°
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sin x ( 1 - cos² x) = 1
sin x ( sin² x) = 1
sin³ x = 1
∛sin³ x = ∛1
sin x = 1
x = 90°