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$The equation \cos^{8} x + b \cos^{4} x + 1 = 0 will have solution if b \in$

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(−∞ , 2]

(−∞ ,- 2]

[2, ∞)

0, 1

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detailed solution

Correct option is B

Given equation can be written as b=-cos4x+1cos4x⇒b∈(-∞,-2]

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The equation cos8x+bcos4x+1=0 will have solution if b∈

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$The equation \cos^{8} x + b \cos^{4} x + 1 = 0 will have solution if b \in$