Question

$( {sec}^{2} \alpha - 1)(1 - {cosec}^{2} \alpha )$
is equal to
(a) -1
(b) 1
(c) 0
(d) 2​

Answer 1

Answer:

Your answer is..

(sec^2 A - 1) (1 - cosec^2 A)

= tan^2 A * cot^2 A

= sin^2 A/cos^2 A * cos^2 A/sin^2 A

= 1

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