[" If "tan alpha=(x)/(x+1)" and "tan bet...

[" If "tan alpha=(x)/(x+1)" and "tan beta=(1)/(2x+1)," then "alpha+beta" is equal to "],[[" A) "(pi)/(2)," B) "(pi)/(3)],[" C) "(pi)/(6)," D) "(pi)/(4)]]

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