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If $x^{2} + 5 = 2 x - 4 \cos (a + b x)$ , where $a, b \in (0, 5)$ , is satisfied for at least one real x, then the maximum value of a+b is equal to

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Correct option is A

x2+5=2x−4cos(a+bx) ⇒ (x−1)2+4(1+cos(a+bx))=0 ⇒ cos(a+b)=−1

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Ifx2+5=2x−4cos(a+bx) , where a,b∈(0,5) , is satisfied for at least one real x, then the maximum value of a+b is equal to

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If $x^{2} + 5 = 2 x - 4 \cos (a + b x)$ , where $a, b \in (0, 5)$ , is satisfied for at least one real x, then the maximum value of a+b is equal to