Simplify (cos x- sin x)(cos x+ sin x). sin x cos x O 2 cos x-1 2 cos x+1

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A: Here , We will apply the formula of Cos ( A+B) Cos(A+B) = [CosA CosB - SinA SinB ]

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A: cos2x -sin2x=2cos2x-1

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A: Use the trigonometry ratio formula for cosx

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