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$If x = 30^{\circ} then the sum of the series 1 + \cos 2 x + \cos^{2} 2 x + \dots + \infty is$

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Correct option is C

1+cos⁡60+cos2⁡60+…=1+12+122+123+…∞=11−1/2=2 since sum of infinite terms inG.P=a1-r

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If x=30∘ then the sum of the series 1+cos⁡2x+cos2⁡2x+…+∞ is

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$If x = 30^{\circ} then the sum of the series 1 + \cos 2 x + \cos^{2} 2 x + \dots + \infty is$