सही विकल्प चुनिए और अपने विकल्प की पुष्टि कीजिए:
9 sec²A - 9 tan²A बराबर हैं

1

9

8

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

अत: विकल्प (B) सही हैं।

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