A triangular wave pulse as shown by the blue line can be formed by adding 
A) harmonic sine waves with different frequencies and intensities.
B) harmonic cosine waves with different frequencies and intensities.
C) a combination of harmonic sine and cosine waves with different frequencies and intensities.
D) either (A) , (B) or (C)
E) it is not possible to form triangular using harmonic waves.
Correct Answer:
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