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Black Advanced Problems in Mathematics
Exam
Black Advanced Problems in Mathematics
Subject
Mathematics
Chapter
Quadratic Equation

Black Advanced Problems in Mathematics · Mathematics · Quadratic Equation

The complete set of values of a so that equation ^4 x + a ^2 x + 4...

The complete set of values of a so that equation sin⁡4x+asin⁡2x+4=0\sin^4 x + a \sin^2 x + 4 = 0 has at least one real root is :

Options

  1. A(∞,−5](\infty, -5]
  2. B(−∞,4]∪[4,∞)(-\infty, 4] \cup [4, \infty)
  3. C(−∞,−4](-\infty, -4]
  4. D[4,∞)[4, \infty).

Correct answer

A. (∞,−5](\infty, -5]

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