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De Moivre's formula using prove that,
written 3.0 years ago by | • modified 3.0 years ago |
If a=cosθ+isinθ,b=cosϕ+isinϕ prove that
(i) cos(θ+ϕ)=12[ab+1ab]
(ii) sin(θ−ϕ)=12i[ab−ba]
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