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2 - Yahoo奇摩 搜尋結果
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數學!!!!!!!!!!!!!!! cos 2題
Oct 25th 2013, 18:57

數學!!!!!!!!!!!!!!! cos 2題 6157 已知cos40◦＝0.7660，而cosθ＝－0.7660...sin142◦的值 第一題cosθ=-0.7660cosθ在第2和第3象限是負值...所以cos(180+40)=-0.7660θ=220...
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