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12th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-10

  • question_answer
    If \[f(x)=\left| \begin{matrix}    \sec \theta  & {{\tan }^{2}}\theta  & 1  \\    \theta \sec x & \tan x & x  \\    1 & \tan x-\tan \theta  & 0  \\ \end{matrix} \right|,\]  then \[f'(\theta )\]  is equal to_______.

    A)  0                                

    B)  \[-1\]

    C)  2                                

    D)  3

    E)  None of these

    Correct Answer: B

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