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[" (14) "quad 4sin^(2)(theta-alpha)*cos ...

[" (14) "quad 4sin^(2)(theta-alpha)*cos alpha=cos^(2)(theta-alpha)*sin alpha=],[msn alpha*cos alpha" then "rarr],[[" (a) "|m|geqslant sqrt(2)," (b) "|m|geqslant(1)/(sqrt(2))],[" (c) "|m|leqslant sqrt(2)," (0) "N0" T."]]

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