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第一次算成sin快搞死我 w
三角函數的公式
cos(a+b)=cos a × cos b - sin a × sin b
謝謝你，我知道了！
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✨ Best Answer ✨
第一次算成sin快搞死我 w
三角函數的公式
cos(a+b)=cos a × cos b - sin a × sin b
謝謝你，我知道了！
Users viewing this question
are also looking at these questions 😉
第二行是怎麼來的?