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Mathematics 12 Online
OpenStudy (anonymous):

differentiate 2^x^3

OpenStudy (john_es):

\[(2x^3)'=3\cdot2x^{3-1}=6x^2\]

OpenStudy (anonymous):

its 2 to the power x to the power 3 |dw:1366795945265:dw|

OpenStudy (anonymous):

put y=(2^x^3)... use logarithms on both sides then differentiate. You need to find dy/dx :) Hope this helps.

OpenStudy (anonymous):

:(

OpenStudy (anonymous):

@yashdhanuka - did you not understand ??

OpenStudy (anonymous):

no

OpenStudy (anonymous):

ln(y)=(x^3) (ln(2)) did u understand this ???

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

@yashdhanuka we use logarithmic function to take powers in multiplication so that it is easy to solve :)

OpenStudy (anonymous):

d(ln(y))/dx = (1/y)*(dy/dx) did u understand this ??

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

thanks a lot @xavier123 :)

OpenStudy (anonymous):

i got the the answer

OpenStudy (agent0smith):

\[\LARGE y = 2^{x^{3}}\] take natural logs of both sides \[\LARGE \ln y = \ln 2^{x^{3}}\] \[\Large \ln y = x^3 \ln 2\] now either differentiate implicitly, or put both sides to the power of e: \[\LARGE y = e ^ {x^3 \ln 2}\] Now differentiate. The derivative of \[\Large e^{f(x)}\] is \[\Large f'(x) e ^ {f(x)}\]

OpenStudy (anonymous):

so, differentiate both the sides of the previous equation, => dy/dx=(y)* d(x^3)/dx and evaluate.

OpenStudy (anonymous):

thanks a ton :D

terenzreignz (terenzreignz):

Just more generally, @agent0smith \[\huge \frac{d}{dx}a^{f(x)}=\ln(a)f'(x)a^{f(x)}\]

OpenStudy (anonymous):

thanks a lot

terenzreignz (terenzreignz):

Only if a is a constant, ok?

OpenStudy (john_es):

Sorry, XD. I missunderstand the function XD

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