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[" 19.If "(-)/(sin y)=(-)/(2),(-1,n)/(co...

[" 19.If "(-)/(sin y)=(-)/(2),(-1,n)/(cos y)=(5)/(2)," where "x,y in(0,(pi)/(4))," then the value of "tan(x+y)" is equal to "],[[" 1) "sqrt(13)," 2) "sqrt(14)," 3) "sqrt(17)," 4) "sqrt(15)]]

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