A technique for resolving complex repetitive waveforms into sine or cosine waves and a DC component is known as:

(A) Fourier Analysis

(B) Harmonic Analysis

(C) Frequency Analysis

(D) Armstrong's Principle

(A) Fourier Analysis

Explanation:

Fourier Analysis

It is the form of study of the way a general functions can be represented via the sum of the simple trigonometric functions.

It is named after Joseph Fourier, who represented a function as a sum of its trigonometric functions and it simplifies the study of the heat transfer.

Hence,

The technique for resolving the complex repetitive waveforms into the sine or the cosine waves and the DC component is known as the Fourier Analysis.