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Prove that: (cosalpha+cosbeta)^2+(sinalp...

Prove that: `(cosalpha+cosbeta)^2+(sinalpha+sinbeta)^2=4cos^2((alpha-beta)/2)`

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  3. Prove that: (cosalpha+cosbeta)^2+(sinalpha+sinbeta)^2=4cos^2((alpha-be...

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