Choose the correct option and Justify your choice.
9 sec²A - 9 tan²A =
(A) 1 (B) 9 (C) 8 (D) 0

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Solution

space 9 sec squared straight A space minus space 9 tan squared straight A space space space space space space space space space space space space space space space space space space equals space 9 space left parenthesis tan squared straight A plus 1 right parenthesis space minus space 9 tan squared straight A space space space space space space space space space space space space space space space space space space equals space 9 space tan squared straight A space plus space 9 space minus space 9 space tan squared straight A space space space space space space space space space space space space space space space space space space equals space 9

Hence, correct option is (B)

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