roselin
write the function in the form y=f(u) and u=g(x). then find the dy/dx as a function of x.
y= 5cos^4 x



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RadEn
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first, let u = 4x
du/dx = ....

roselin
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okay

roselin
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4

RadEn
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sorry... i didnt see ur question well
it should be
dw:1354847698924:dw

roselin
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okay..

RadEn
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next,
dw:1354848159596:dw

RadEn
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dy/dx = du/dx * dy/du , actually it's called chain's rule

roselin
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yeah, thanks a lot. i have one more question, would you be willing to help me with me? i am kind of confused.

RadEn
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close ur question, n post it in new question