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  3. we know ej cos j sin ...

Question: we know ej cos j sin ...

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We know ej✓ = cos ✓ + j sin ✓. Use this formula to prove cos ✓1 cos ✓2 = 12 (cos(✓1 + ✓2) + cos(✓1

Problem 4. We know eja-cos θ +j sin θ. Use this formula to prove cos cos θ2 (cos(4 + θ2) + cos(4-02)). (hint: check ei ej0g, we will use this in the analysis of amplitude modulation)

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