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Question

sec4 A − sec2 A is equal to

(a) tan2 A − tan4 A
(b) tan4 A − tan2 A
(c) tan4 A + tan2 A
(d) tan2 A + tan4 A

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Solution

The given expression is .

Taking common from both the terms, we have



Disclaimer: The options given in (c) and (d) are same by the commutative property of addition.

Therefore, the correct options are (c) or (d).


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