secA + tanA = 5/2 হলে, secA - tanA = ? 

A 1/2

B 1/5

C 2/5

D 5/2

Solution

Correct Answer: Option C

sec2A - tan2A = 1
⇒ (secA + tanA)(secA - tanA) = 1 
∴ (secA - tanA) = 1/(5/2) = 2/5

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