Determine the resulting waveform, Electrical Engineering

Two pure sine waves have similar amplitude "A" and frequency "f." They are out of phase through 180 degrees. If these two signals are added, the resulting waveform will be:

Nothing
A sinewave along with amplitude of 2a and frequency 2f.
A sinewave along with an amplitude of "a" and out of phase by 90° from both waveforms in reverse directions.
A sinewave along with an amplitude of a/2 and frequency "f."

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