No
By shifting the sine wave by 45 degrees.
The Fourier transform of a sine wave is a pair of delta functions located at the positive and negative frequencies of the sine wave.
A sine wave is the graph of y = sin(x). It demonstrates to cyclic nature of the sine function.
The voice is not a sine wave.
Most of the inverters cant reproduce proper Sine Wave.They are usually producing modified square waves.Some high cost inverters can produce pseudo sine wave(more similar to sine wave). The fans field windings are designed to produce proper revolving field only with standard sine wave.When using modified square wave the field produced will be jerky.These jerks are the main reason of sound.The un-filtered harmonics in the produced wave is also a factor
a phase shifted sine wave of a different amplitude.
Sine wave is considered as the AC signal because it starts at 0 amplitude and it captures the alternating nature of the signal. Cosine wave is just a phase shift of the sine wave and represents the same signal. So, either sine or cosine wave can be used to represent AC signals. However, sine wave is more conventionally used.
cos wave
A sine wave has no harmonics. It only has a fundamental, so the value of the 2nd, 3rd, and 12th harmonics of a sine wave is zero.
It's called a sine wave because the waveform can be reproduced as a graph of the sine or cosine functions sin(x) or cos (x).
The sine wave, with its repeating pattern, can represent a single frequency with no harmonics.
avr would be cheaper but normally provides a "sawtooth" type wave instead of a pure sine wave. AVR was made for computer equipment that is less sensitive than home theater equipment where a "dirty" wave will create artifacts and shadows as well as have a noise effect on audio equipment. In short if you can afford it get a pure sine wave UPS, but if not AVR will be better than nothing.