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  3. If sec θ – tan θ = a+1/a-1, then cos θ =

. If sec θ – tan θ = a+1/a-1, then cos θ =

If sec θ – tan θ = a+1/a-1, then cos θ =

A. a2 + 1/a2 - 1

B. a2 - 1/a2 + 1

C. a2 /a2 +1

D. a2 /a2 - 1

Best Answer

Correct Answer:

B. a2 - 1/a2 + 1

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