secA+tanA=5/2 হলে secA-tanA=?

A 2/5

B 3/5

C 3/6

D 4/3

Solution

Correct Answer: Option A

দেওয়া আছে ,
secA+tanA=5/2

আমরা জানি ,
     sec²A - tan²A= 1
বা,(secA+tanA)(secA-tanA)=1
বা,5/2×(secA-tanA)=1
বা,secA-tanA=2/5

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