上下同除cosa
(sina-3cosa)/(sina+cosa)
=(sina/cosa - 3)/(sina/cosa +1)
=(tana-3)/(tana+1)
sina - 3cosa
= ------------------------------
sina + cosa
sina 3cosa
------- - -------
cosa cosa
= ------------------------------
sina cosa
------- + -------
cosa cosa
tan a - 3
= ------------------------------
tan a + 1
(sina-3cosa)/(sina+cosa)為什么會(huì)等于(tana-3)/(tana+1)求其轉(zhuǎn)換過(guò)程!你能再詳細(xì)點(diǎn)么?
(sina-3cosa)/(sina+cosa)為什么會(huì)等于(tana-3)/(tana+1)求其轉(zhuǎn)換過(guò)程!你能再詳細(xì)點(diǎn)么?
數(shù)學(xué)人氣：757 ℃時(shí)間：2020-06-04 04:21:12
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