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Identify the mathematical expression for amplitude modulated wave:

(a) Ac sin [{ωc + k1vm(t)}t + φ ].

(b) Ac sin {ωct + φ + k2 vm(t)}.

(c) {Ac + k2 vm(t)} sin (ωct + φ ).

(d) Ac vm(t) sin (ωct + φ ).

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(c) {Ac + k2 vm(t)} sin (ωct + φ ).

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