$\int \frac{dx}{\cos(x - a)\cos(x - b)} = $

  • A
    $\csc(a - b) \ln \left| \frac{\sin(x - a)}{\sin(x - b)} \right| + C$
  • B
    $\csc(a - b) \ln \left| \frac{\cos(x - a)}{\cos(x - b)} \right| + C$
  • C
    $\csc(a - b) \ln \left| \frac{\sin(x - b)}{\sin(x - a)} \right| + C$
  • D
    $\csc(a - b) \ln \left| \frac{\cos(x - b)}{\cos(x - a)} \right| + C$

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$\int [1+2 \tan x(\tan x+\sec x)]^{\frac{1}{2}} dx = $

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