[" (20) "lf(1+tan alpha)(1+tan4 alpha)=2...

[" (20) "lf(1+tan alpha)(1+tan4 alpha)=2,alpha in(0,(pi)/(16))," then "alpha=],[[" (g) "(pi)/(20)," (b) "(pi)/(30)," (c) "(pi)/(40)," (d) "(pi)/(60)]]

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