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Q.

The set of values of 'x' for which tan 3x − tan 2x1 + tan 3x tan2x=1 is

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a

ϕ

b

{π/4}

c

{nπ+π4; n∈z}

d

{2nπ+π4; n∈z}

answer is A.

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Detailed Solution

tanx=1 x=nπ+π4 For this value of x, tan2x is not defined ∴  solution set =ϕ
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