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Question 77Asked in BPSC TRE 1.0 (2023) Mathematics Class 9-10

If sin A + sin²A = 1, then cos²A + cos⁴A = ?यदि sin A + sin²A = 1, तो cos²A + cos⁴A = ?

यदि sin A + sin²A = 1, तो cos²A + cos⁴A = ?
  1. A22
  2. B11
  3. C−1−1
  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: (B) 11

Explanation

sin A = 1 − sin²A = cos²A, so cos²A + cos⁴A = sin A + sin²A = 1.sin A = 1 − sin²A = cos²A, अतः cos²A + cos⁴A = sin A + sin²A = 1।

From BPSC TRE 1.0 (2023) Mathematics Class 9-10 — Previous Year Paper

This is question 77 of BPSC TRE 1.0 (2023) Mathematics Class 9-10 — 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.