The function below models the voltage, in volts, of a certain alternating current after x seconds, where a and b are positive constants.
f(x) = acos(bx)
assume the expression inside the cosine function is measured in radians.
what is the largest value of c such that when the voltage's domain is restricted to the interval [0,c], the function is invertible


hello from mrbilldoesmath!

answer:   x^2 + y^2 = 1024


the equation of a circle with center (h,k) and radius "r" is

(x-h)^2 + (y-k)^2 = r^2.

in our case

(x-0)^2 + (y-0) ^2 = 32^2 = 1024



can i see the following ?

step-by-step explanation:

First of all, we can just ignore A, it has no effect but to vertically stretch our cosine.

If it was only f(x)=cosx, the function would be invertible as long as it's confined between 0 and \pi. Now, the argument of our cosine is not x but bx. It means that it won't stop at \pi, but at \frac{\pi}{b}.

Another way to think about it, "what should i replace x with so I get \pi inside the cosine?"

Do you know the answer?

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