Given that sinθ + cosθ =x, prove that sin⁴θ + cos⁴θ = 2-(x²-1)/2||Given that sin theta +cos theta=x,

Given that sinθ + cosθ =x, prove that sin⁴θ + cos⁴θ = 2-(x²-1)/2||Given that sin theta +cos theta=x,

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