V16 Prove that: ( Cos alpha - cos beta )^2 + ( Sin alpha - Sin beta )^2 = 4Sin^2 {(alpha-beta)/2}

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