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[" Q.22If cos "alpha+cos beta=0=sin alph...

[" Q.22If cos "alpha+cos beta=0=sin alpha+sin beta," then "],[cos2 alpha+cos2 beta" is equal to "],[[" (A) "-2sin(alpha+beta)," (B) "-2cos(alpha+beta)],[" (C) "2sin(alpha+beta)," (D) "2cos(alpha+beta)]]

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