9sec square A-tan square A
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9sec square A-tan square A
=9( sec ^2-tan^2)
=9×1
=9
=9( sec ^2-tan^2)
=9×1
=9
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Answered by
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9( sec2 A - tan2 A)
= 9 × 1
= 9
= 9 × 1
= 9
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