Prove that : cos9 + sin9 = √2 sin54

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cos 9 + sin9 = √2 sin54

cos 9 degree - sin 9 degree

cos 9+sin9/cos9-sin9=tan 54

prove that cos 9 degree + cos 9 degree is equal to root 2 sin 54 degree

the value of cos9 sin9
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