Question

csc²x的导数是什么

Answer 1

-2csc^2xcotx

y′=（csc^2x）′

=[（sinx）^-2]′

=-2（sinx）^-3*sinx′

=-2（sinx）^-3*cosx

=-2（sinx）^-2*cotx

=-2csc^2xcotx

扩展资料：

常用导数公式：

1.y=c(c为常数) y'=0

2.y=x^n y'=nx^(n-1)

3.y=a^x y'=a^xlna，y=e^x y'=e^x

4.y=logax y'=logae/x，y=lnx y'=1/x

5.y=sinx y'=cosx

6.y=cosx y'=-sinx

7.y=tanx y'=1/cos^2x

8.y=cotx y'=-1/sin^2x

9.y=arcsinx y'=1/√1-x^2

10.y=arccosx y'=-1/√1-x^2

11.y=arctanx y'=1/1+x^2

12.y=arccotx y'=-1/1+x^2

Answer 2

Answer 3

如图所示

追问

谢谢啦

Answer 4

二阶导数
y=tan(x+y)
y'=sec²(x+y)*(x+y)'
=sec²(x+y)*(1+y')
=sec²(x+y)+y'sec²(x+y)
y'-y'sec²(x+y)=sec²(x+y)
y'=sec²(x+y)/[1-sec²(x+y)]
=sec²(x+y)/{-[sec²(x+y)-1]}
=sec²(x+y)/[-tan²(x+y)]
=-1/cos²(x+y)*cos²(x+y)/sin²(x+y)
=-csc²(x+y)
y''=-2csc(x+y)*[-csc(x+y)cot(x+y)]*(x+y)'
=2csc²(x+y)cot(x+y)*(1+y')
=2csc²(x+y)cot(x+y)*[1-csc²(x+y)]
=2csc²(x+y)cot(x+y)*{-1[csc²(x+y)-1]}
=-2csc²(x+y)cot(x+y)*[cot²(x+y)]
=-2csc²(x+y)cot³(x+y)

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