Question

9 second square A - 9 tan square A

Answer 1

it is sec2 my friend not second square

here goes the answer............

9 sec2 a - 9 tan2 a

9 can be taken as common

9(sec2a - tan2a)

we know that from the identity sec2 a - tan2 a is 1

so 9(1)

= 9

therefore the value of 9 sec2a - 9 tan2 a = 9

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