If 9sec2 A - 9tan2 A =x, then find the value of x.
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Answer:
ANSWER
9sec
2
A−9tan
2
A,[1−sin
2
A=cos
2
A]
⇒
cos
2
A
9
−
cos
2
A
9sin
2
A
=
cos
2
A
9(1−sin
2
A)
=
cos
2
A
9cos
2
A
=9Ans.
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