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(1+cosalphacosbeta)^2-(cosalpha+cosbeta)...

`(1+cosalphacosbeta)^2-(cosalpha+cosbeta)^2=`

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Show that cos^(-1) ((cos alpha+cos beta)/(1+cosalpha cosbeta))=2 tan^(-1)(tan (alpha/2) tan (beta/2))

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

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