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If cos^4 theta + cos^2 theta = 1 then th...

If `cos^4 theta + cos^2 theta = 1` then the value of `(tan^4 theta + tan^2 theta)` is equal____

A

0

B

-1

C

1

D

cannot be determined

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  13. If 0^@ < A < 90^@, then the value of tan^2 A + cot^2 A - sec^2 A cosec...

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