1.

Evaluate (sec θ – tan θ) (sec θ + tan θ).(a) 0(b) 1(c) 2(d) 3This question was posed to me in a job interview.Query is from Trigonometric Identities in chapter Trigonometry of Mathematics – Class 10

Answer»

The correct choice is (b) 1

Explanation: = (SEC θ – TAN θ) (sec θ + tan θ) = sec^2 θ – tan^2 θ

= 1

The identity USED here is sec^2 θ – tan^2 θ = 1



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