Question: Write the following trigonometric functions in phase-amplitude form: (a) Sin3x, (b) Cosx - sinx (c) 3cos2x + 4sin2x (d) Cosxsinx

Write the following trigonometric functions in phase-amplitude form:
(a) Sin3x,
(b) Cosx - sinx
(c) 3cos2x + 4sin2x
(d) Cosxsinx

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