Find its derivative plx , becoz I don't know how to apply product rules.
更新1:
Nevertheless , does product avaiblie when we apply it to product of 3?
Find its derivative
2009-07-25 8:12 am
f(x) = x*cosx*sinx
Find its derivative plx , becoz I don't know how to apply product rules.
Find its derivative plx , becoz I don't know how to apply product rules.
回答 (2)
2009-07-25 8:34 am
✔ 最佳答案
f(x) = x*cosx*sinx ,Find its derivative Sol
f'(x)=df(x)/dx
=(1/2)d(xsin2x)/dx
=(1/2)xdsin2x/dx+(1/2)sin2xdx/dx
=(x/2)(dsin2x/d2x)*(d2x/dx)+sin2x/2
=xcos2x+sin2x/2
2009-07-25 2:42 pm
For product of 3, product rule still holds.
Let y = uvw, then y' = uvw' + vwu' + uwv'. [This is derived from y = (uv)w' + w(uv)']
Let y = uvw, then y' = uvw' + vwu' + uwv'. [This is derived from y = (uv)w' + w(uv)']
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