Q. 39

# Choose the correct answer:If 2x = sec A and 2/x = tan A then A. B. C. D.

Given: 2x = sec A, and 2/x = tan A

Consider 2(x2 – (1/ x2))

=

=

= (1/2) [sec2 A – tan2 A]

= (1/2)[1]

= 1/2 ( sec2 x – tan2 x = 1)

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