Why sin 90 is 1? When the reference angle becomes 90 and the

Answer (1 of 7): You are restricting your thoughts to the definition of a sine function defined on the acute angles of a right triangle. That definition does not apply when the angles is 90 degrees or larger. With angles of arbitrary size one defines the angles using a point on the unit circle. L

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Why sin 90 is 1? When the reference angle becomes 90 and the