Question 81Asked in BPSC TRE 1.0 (2023) Mathematics Class 11-12

If y = x + x³/3 + x⁵/5 + ..., then dy/dx is equal toयदि y = x + x³/3 + x⁵/5 + ..., तो dy/dx बराबर है

यदि y = x + x³/3 + x⁵/5 + ..., तो dy/dx बराबर है
  1. A1/(1 − x)1/(1 − x)
  2. B1/(1 + x)1/(1 + x)
  3. C1/(1 − x²)1/(1 − x²)
  4. DMore than one of the aboveउपर्युक्त में से एक से अधिक
  5. ENone of the aboveउपर्युक्त में से कोई नहीं
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Correct answer: (C) 1/(1 − x²)1/(1 − x²)

Explanation

Differentiating term by term gives dy/dx = 1 + x² + x⁴ + ..., a geometric series with sum 1/(1 − x²) for |x| < 1.पद-दर-पद अवकलन करने पर dy/dx = 1 + x² + x⁴ + ... मिलता है, जो |x| < 1 के लिए योग 1/(1 − x²) वाली गुणोत्तर श्रेणी है।

From BPSC TRE 1.0 (2023) Mathematics Class 11-12 — Previous Year Paper

This is question 81 of BPSC TRE 1.0 (2023) Mathematics Class 11-12 — Previous Year Paper. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.