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If f(x)=|{:(sectheta," "tan^(2)theta,1),...

If `f(x)=|{:(sectheta," "tan^(2)theta,1),(thetasecx," "tanx,x),(" "1,tanx-tantheta,0):}|`, then `f'(theta)` is

A

zero

B

`-1`

C

independent of `theta`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
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