9sec²A - 9 tan²A. evalute step by step
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Answer: 9
Step-by-step explanation:
9sec²A- 9tan²A
Taking 9 common from both the terms,
= 9(sec²A-tan²A)
Since, sec²A – tan²A = 1 (for 0°≤ A <90°)
= 9(1)
= 9
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