$\int \frac{\sec^2 x}{(1 + \tan x)(2 + \tan x)} \, dx$ का मूल्यांकन करने के लिए,सबसे उपयुक्त प्रतिस्थापन (substitution) क्या है?

  • A
    $1 + \tan x = t$
  • B
    $2 + \tan x = t$
  • C
    $\tan x = t$
  • D
    इनमें से कोई नहीं

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