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Prove the trigonometric identity below. Show all steps algebraically
(𝑥sinθ − 𝑦cosθ)^2 + (𝑥cosθ + 𝑦sinθ)^2 = 𝑥^2 + 𝑦^2
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Sorry for reposting this problem but I couldn't understand the process from the previous post. However, i do get it now, thanks anyways