Question

2. Use what you know about complex numbers in polar form to derive the identity sin(a + b) = sin(a) cos(b) + cos(a) sin(b)
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lo We know that: Coso tisino ( Fulorrs formula) So Releio Coso Im leio) sino similarly, following the process ) sin (atb) =if you have any doubt regarding this particular question then please comment,i will do my best to resolve your issue.

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