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這麼和您說吧.無論是三角函數的,無論是代數的,只要是出現了含有“1”的等式,都可以逆回去來用的.比如,以三為底,三的對數等於一.反之,也可以. 比如cos2A=1-2*(sinA)^2.這是二倍角的余弦公式.我們完全可以把“1”分析出來,得到: 1=cos2A+2*(sinA)^2. 你可以從書上找一找,哪怕是還沒有學過的.對你的學習好處大大的.
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