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If the value of tan2 θ + tan4 θ = 1, what will be the value of cos2 θ + cos4 θ?

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If the value of tan<sup>2</sup> θ + tan<sup>4</sup> θ = 1, what will be the value of cos<sup>2</sup> θ + cos<sup>4</sup> θ?






 
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