Question 115Asked in BPSC TRE 3.0 (2024) Mathematics Class 11-12

Value of (1 + i)⁴ is(1 + i)⁴ का मान है

(1 + i)⁴ का मान है
  1. A−4−4
  2. B4e^(iπ)4e^(iπ)
  3. C−4e^(−iπ/2)−4e^(−iπ/2)
  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: (D) More than one of the aboveउपर्युक्त में से एक से अधिक

Explanation

(1 + i)² = 2i, so (1 + i)⁴ = (2i)² = −4. Also 4e^(iπ) = 4(cos π + i sin π) = −4, while −4e^(−iπ/2) = −4(−i) = 4i. So both (A) and (B) are correct - answer (D).(1 + i)² = 2i, इसलिए (1 + i)⁴ = (2i)² = −4। साथ ही 4e^(iπ) = 4(cos π + i sin π) = −4, जबकि −4e^(−iπ/2) = −4(−i) = 4i। अतः (A) और (B) दोनों सही हैं - उत्तर (D)।

From BPSC TRE 3.0 (2024) Mathematics Class 11-12 — Previous Year Paper

This is question 115 of BPSC TRE 3.0 (2024) 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.