史上最強的自我介紹
Derivatives of sin x, cos x, tan x, e^x and ln x | Derivatives of common functions | Khan Academy我是個成熟男人但是我的長相顯年輕體形魁梧,給人一種大哥的感覺我事業成功,是個老闆走到哪裡都拎著筆記本我坐的車比林肯車還寬敞多年在北京大學的燻陶,成就了我的文化品位我閒遐時研究中國古代史,尤其是清史我也跟得上時代的潮流經常看美國電影特別是那種探討人生的社會倫理片喜歡揣摩電影人物的心理活動經常跟上流社會Lets say I have an equation sin x = 1/2. Then clearly, x = 30 degrees or pi/6 radians. Now if I differentiate both sides of the equation with respect to x (because both are equal, their derivatives should also be equal), I will have cos x = 0, right? But ...
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