If cosalpha+cosbeta=0=sinalpha+sinbeta, ...

If `cosalpha+cosbeta=0=sinalpha+sinbeta,` then `cos2alpha+cos2beta` is equal to (a)`-2"sin"(alpha+beta)` (b) `-2cos(alpha+beta)` (c)`2"sin"(alpha+beta)` (d) `2"cos"(alpha+beta)`

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