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[" If "cos2 theta-cos3 theta-cos40+cos50...

[" If "cos2 theta-cos3 theta-cos40+cos50=lambda sin(0)/(2)sin theta cos(7)/(2)theta," then "lambda" is equals to "],[[" (A) "(-2)/(2)," (B) "-4],[" (D) none of these "]]

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