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[" If "tan alpha=(m)/(m+1),tan beta=(1)/...

[" If "tan alpha=(m)/(m+1),tan beta=(1)/(2m+1)," then "alpha+beta" is cqual to "],[[" (a) "bar(y)/2," (b) "pi/3," (c) "pi/6," (d) "pi/4]]

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