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並前往https://socratic.org/questions/why-does-cos-90-x-sin-x-and-sin-90-x-cos-x

Why does cos(90 - x) = sin(x) and sin(90 - x) = cos(x)?

Note that the image below is only for x in Q1 (the first quadrant). If you wish you should be able to draw it with x in any quadrant.

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