三角函數sin 30的相關文章
Trigonometric functions - Wikipedia, the free encyclopedia

Trigonometric functions - Wikipedia, the free encyclopedia

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日期:2025-05-05
Sine, cosine and tangent [edit] The sine of an angle is the ratio of the length of the opposite side to the length of the hypotenuse. (The word comes from the Latin sinus for gulf or bay, since, given a unit circle, it is the side of the triangle on which...看更多