What is a positive value of x for which 9^(-cos x) = 1/3?

NOTE: The (-cos x) is the exponent in this case.

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- Sep 30th 2008, 08:32 PMmagentaritaPositive Value of x
What is a positive value of x for which 9^(-cos x) = 1/3?

NOTE: The (-cos x) is the exponent in this case. - Sep 30th 2008, 08:41 PMChris L T521
I'll nudge you in the right direction:

$\displaystyle 9^{-\cos(x)}=\frac{1}{3}$

Note that $\displaystyle \frac{1}{3}=3^{-1}$ and $\displaystyle 9=3^2$

So we can rewrite the equation as this: $\displaystyle 3^{-2\cos(x)}=3^{-1}$

I'm sure you can take it from here.

--Chris - Oct 1st 2008, 03:59 PMmagentaritayes.....