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並前往https://www.khanacademy.org/math/trigonometry/trigonometry-right-triangles/reciprocal-trig-ratios/a/sine-and-cosine-are-cofunctions

Sine & cosine of complementary angles - Khan Academy

Triangles! Patterns of right triangles. All triangles have 3 angles that add to 180 degrees. Therefore, if one angle is 90 degrees we can figure out Sin Theta ...

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