If `cosalpha+cosbeta=0=s inalpha+s inbeta,` then prove that `cos2alpha+cos2beta=-2cos(alpha+beta...

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If `cos alpha+cos beta=0=sin alpha+sinbeta, then cos2alpha+cos 2beta=` If `cos alpha+cos beta=0=sin alpha+sinbeta, then cos2alpha+cos 2beta=`
If `cosalpha+cosbeta = 0=sinalpha+sinbeta`, then `cos2alpha+cos2beta` is equal to If `cosalpha+cosbeta = 0=sinalpha+sinbeta`, then `cos2alpha+cos2beta` is equal to
If `cosalpha+cosbeta=0=sinalpha+sinbeta`, then prove that If `cosalpha+cosbeta=0=sinalpha+sinbeta`, then prove that
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