# Thread: Derivative

1. ## Derivative

How do i find the derivative of the following? I'm having trouble on what kind of rule to use.

f(x)=5/(x^3) - 3/(2-7x) + 3x^5 - 15 (Quotient rule?)

g(x) = tan(x)ln(2x+5) (product rule?)

y=cos(3-2x^4) (chain Rule??)

thanks for your help

2. Originally Posted by tim_mannire How do i find the derivative of the following? I'm having trouble on what kind of rule to use.

f(x)=5/(x^3) - 3/(2-7x) + 3x^5 - 15 (Quotient rule?)
the derivative of a sum is the sum of derivatives. Then the power rule and chainrule.

g(x) = tan(x)ln(2x+5) (product rule?)
product rule and chain rule

y=cos(3-2x^4) (chain Rule??)
chain rule

CB

3. Just in case a picture helps... Originally Posted by CaptainBlack  Originally Posted by tim_mannire How do i find the derivative of the following? I'm having trouble on what kind of rule to use.

f(x)=5/(x^3) - 3/(2-7x) + 3x^5 - 15 (Quotient rule?)
the derivative of a sum is the sum of derivatives. Then the power rule and chainrule.  Originally Posted by tim_mannire g(x) = tan(x)ln(2x+5) (product rule?)
product rule and chain rule ... or, zooming in further...  Originally Posted by tim_mannire y=cos(3-2x^4) (chain Rule??)

thanks for your help
chain rule

CB ... where ... is the product rule ... the chain rule. Straight continuous lines differentiate downwards (integrate up) with respect to x, and the straight dashed line similarly but with respect to the dashed balloon expression (the inner function of the composite which is subject to the chain rule).

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