maths & statis

2006-10-24 5:18 am

Differentiation

FIND dy over dx

y=ln ( cos(2x 2次))2次

唔識計... 有冇人可以幫下我...
同埋differentiation 呢課我超級唔明ga...
有冇人可以簡單講下係計d咩? 要做d咩?
呢課最重要係d咩?thanks!!!

回答 (1)

2006-10-24 5:20 am

✔ 最佳答案

dy/dx
={1/[cos(2x^2)]^2 }[2cos(2x^2)][-sin(2x^2)][4x]
=-8x[cos(2x^2)][sin(2x^2)]/[cos(2x^2)]^2
=-8x[sin(2x^2)]/[cos(2x^2)]
= -8x[tan(2x^2)]

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