find the value of 9 sec²A-9tan²A
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9sec²A - 9tan²A
= 9(sec²A-tan²A)
= 9(sec²A-(sec²A-1))
= 9(sec²A-sec²A-1)
= 9(1)
= 9
= 9(sec²A-tan²A)
= 9(sec²A-(sec²A-1))
= 9(sec²A-sec²A-1)
= 9(1)
= 9
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