NDA Government Jobs Exams

What is tan^4A – sec^4A + tan^2A + sec^2A equal to

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If A + B = 90º, then what is sqrt(sinA secB− sinAcosB) equal to Which one of the following points lies inside a circle of radius 6 and centre at (3, 5) ?
(a) (–2, –1) (b) (0, 1) (c) (–1, –2) (d) (2, –1)