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## Homework Statement

An acoustic signal is composed of the first three harmonics of a wave of fundamental frequency 463 Hz. If these harmonics are described, in order, by cosine waves with amplitudes of 0.100, 0.300, and 0.760, what is the total amplitude of the signal at time 0.401 seconds? Assume the waves have phase angles θn = 0.

## Homework Equations

F(t)= Sum of Ancos(2nf1t-0n)

## The Attempt at a Solution

I simply plugged in the above values into the equation and got 0.00600897, -0.29783, and -0.136345. No idea where to go from here. Any assistance is appreciated!