Cosine of double angle with three equivalent forms. Choose the form based on what's given in the problem.
Power reduction — Simplifying integrals: cos²x = (1+cos2x)/2.
AC power — RMS calculations in electrical engineering.
Optics — Interference pattern intensity calculations.
Signal processing — Carrier wave modulation.
Physics — Polarized light intensity (Malus's law).
Computer graphics — Texture mapping calculations.
Fourier analysis — Harmonic decomposition.
Mechanics — Vibration analysis in rotating systems.
Crystallography — X-ray diffraction calculations.
Music — Harmonic overtone analysis.
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