Q.

If tanθ=ntanϕthen the maximum value of tan2(θϕ)is equal to

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a

(n+1)24n

b

(n1)24n

c

(n+1)22n

d

(n1)22n

answer is B.

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Detailed Solution

tan(θϕ)=tanθtanϕ1+tanθtanϕ=(n1)tanϕ1+ntan2ϕtan(θϕ)=n1cotϕ+ntanϕcotϕ+ntanϕ2ntan2(θϕ)=(n1)2cotϕ+ntan2ϕ2 maximum value of tan2(θϕ)=(n1)24n

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