B. (1 / 7)tan^(-1)(x / 7)+C
ExplanationStep 1: identify the standard form ∫dx/(a^2+x^2). Step 2: the answer is (1/a)tan^(-1)(x/a)+C, here a=7. Step 3: memory tip: a^2+x^2 gives inverse tangent.
Step 1: standard form ∫dx/(a^2+x^2) पहचानिए। Step 2: answer (1/a)tan^(-1)(x/a)+C होता है, यहाँ a=7 है। Step 3: memory tip: a^2+x^2 inverse tangent देता है।
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