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ZhangYuanyi 《中学数学杂志》2005,(1):63-64
It is very important to find the derivativeof sine in mathematics. For each derivative oftrigonometric functions is begin with sine. Thesketch of its proof is transforming twosubtracted sine functions into the form ofmultiplication . But this methodappears the form of fraction, so it is difficultfor the beginners and the self - learners tounderstand the increment of the sine function 相似文献
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