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      Question

      The value of (1 + sin⁴ A – cos⁴

      • A cosec² A is:
      A −2 Correct Answer Incorrect Answer
      B 2 Correct Answer Incorrect Answer
      C 1 Correct Answer Incorrect Answer
      D −1 Correct Answer Incorrect Answer

      Solution

      To simplify (1 + sin⁴ A – cos⁴ A) cosec² A   Use cos4 A = (1- sin² A) ² = 1-2 sin² A + sin4 A. Substitute: 1+ sin A4 -cos4 A = 2 sin² A. The expression becomes: (2 sin² A) csc² A = 2 sin² A. (1 /sin2 A) = 2. Thus, the value is 2.

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