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Question

If tan(AB)=1 , sec(A+B)=23, then the smallest positive value of B is,

A
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B
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C
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D
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Solution

The correct option is B

tan(A-B)=1

AB=(2n+1)π4

n=0 since question is the smallest value possible

AB=π4

A+B=2ππ6=11π6

Subtract both the equations

2B=11π6π4

2B=(223)π12

B=19π24


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