Identify the mathematical expression for amplitude modulated wave: ...

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Identify the mathematical expression for amplitude modulated wave:
\( \mathrm{P} \)
(a) \( A_{c} \sin \left[\left\{\omega_{c}+k_{1} v_{m}(t)\right\} t+\phi\right] \).
W
(b) \( A_{c} \sin \left\{\omega_{c} t+\phi+k_{2} v_{m}(\mathrm{t})\right\} \).
(c) \( \left\{A_{c}+k_{2} v_{m}(\mathrm{t})\right\} \sin \left(\omega_{c} t+\phi\right) \).
(d) \( A_{c} v_{m}(\mathrm{t}) \sin \left(\omega_{c} t+\phi\right) \).
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