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Evaluate sec^2 A + (1 + tan A) (1 – tan A).(a) 3(b) 0(c) 2(d) 1I had been asked this question in semester exam.My question is taken from Trigonometric Identities in portion Trigonometry of Mathematics – Class 10

Answer»

Correct CHOICE is (C) 2

For explanation I WOULD say: sec^2 A + (1 + TAN A) (1 – tan A) = sec^2 A + 1^2 – tan^2 A

= (sec^2 A – tan^2 A) + 1

= 1 + 1

= 2



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