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if (a sec theta + b tan theta) = 1 and (a2 sec2 theta- b2 tan2 theta )=5, then a2b2+4a2 is equal to
a)9b2
b)9/a2
c)-2/b
d)9

9b^2
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Bracket cos square A into Sin A + Cos A by cos square a Sin A minus Cos A + sin square a Sin A minus Cos A by sec square a Sin A + Cos A then sin square A minus cos square A is equal to what
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Dear student and all those students who are facing problem while solving the given question,
            The question is very simple, though it is not necessary it is solved by everyone, every individual is a learner and it's awesome to clear your doubts. Only basic concepts and formulas are used which can easily understood. I'm sure after referring the solution below you too will know why this question is very simple.



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a) 9b2
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