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Hi,
I got this following relationship:
1) (a+ib)(cosx+isinx) = acosx - bsinx
2) (a-ib)(cosx+isinx) = acosx + bsinx
3) i(cosx+isinx) = -sinx
I wonder if there exists any formula/property to justify/prove the validity of above relationship. Any comment/idea would be very much appreciated!
Thanks
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