y=ln(secx+tanx)求导.实在是想不通.方法一:y'=[1/(secx+tanx)]*(secxtanx+sec²x) =(secxtanx+sec²x)/(secx+tanx) =secx(secx+tanx)/(secx+tanx) =secx可是方法二:secx+tanx=tanx/2,那么y'=lntanx/2=[1/(tanx/2)]*sec²x*1/2=cscx
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![y=ln(secx+tanx)求导.实在是想不通.方法一:y'=[1/(secx+tanx)]*(secxtanx+sec²x) =(secxtanx+sec²x)/(secx+tanx) =secx(secx+tanx)/(secx+tanx) =secx可是方法二:secx+tanx=tanx/2,那么y'=lntanx/2=[1/(tanx/2)]*sec²x*1/2=cscx](/uploads/image/z/5252916-12-6.jpg?t=y%3Dln%28secx%2Btanx%29%E6%B1%82%E5%AF%BC.%E5%AE%9E%E5%9C%A8%E6%98%AF%E6%83%B3%E4%B8%8D%E9%80%9A.%E6%96%B9%E6%B3%95%E4%B8%80%EF%BC%9Ay%27%3D%5B1%2F%28secx%2Btanx%29%5D%2A%28secxtanx%2Bsec%26%23178%3Bx%29+%3D%28secxtanx%2Bsec%26%23178%3Bx%29%2F%28secx%2Btanx%29+%3Dsecx%28secx%2Btanx%29%2F%28secx%2Btanx%29+%3Dsecx%E5%8F%AF%E6%98%AF%E6%96%B9%E6%B3%95%E4%BA%8C%EF%BC%9Asecx%2Btanx%3Dtanx%2F2%2C%E9%82%A3%E4%B9%88y%27%3Dlntanx%2F2%3D%5B1%2F%28tanx%2F2%29%5D%2Asec%26%23178%3Bx%2A1%2F2%3Dcscx)
y=ln(secx+tanx)求导.实在是想不通.方法一:y'=[1/(secx+tanx)]*(secxtanx+sec²x) =(secxtanx+sec²x)/(secx+tanx) =secx(secx+tanx)/(secx+tanx) =secx可是方法二:secx+tanx=tanx/2,那么y'=lntanx/2=[1/(tanx/2)]*sec²x*1/2=cscx
y=ln(secx+tanx)求导.实在是想不通.
方法一:y'=[1/(secx+tanx)]*(secxtanx+sec²x) =(secxtanx+sec²x)/(secx+tanx) =secx(secx+tanx)/(secx+tanx) =secx
可是方法二:secx+tanx=tanx/2,那么y'=lntanx/2=[1/(tanx/2)]*sec²x*1/2=cscx
这是什么情况?
y=ln(secx+tanx)求导.实在是想不通.方法一:y'=[1/(secx+tanx)]*(secxtanx+sec²x) =(secxtanx+sec²x)/(secx+tanx) =secx(secx+tanx)/(secx+tanx) =secx可是方法二:secx+tanx=tanx/2,那么y'=lntanx/2=[1/(tanx/2)]*sec²x*1/2=cscx
secx+tanx=tan(x/2)是哪来的,明显不对啊.
把x=0代入得:1=0
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求导 y=ln(secx+tanx)=[1/(secx+tanx)]*(secxtanx+(secx)^2)=secx
y=ln(secx+tanx)求导.实在是想不通.方法一:y'=[1/(secx+tanx)]*(secxtanx+sec²x) =(secxtanx+sec²x)/(secx+tanx) =secx(secx+tanx)/(secx+tanx) =secx可是方法二:secx+tanx=tanx/2,那么y'=lntanx/2=[1/(tanx/2)]*sec²x*1/2=cscx
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