Prove that............
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I think it will help u
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Using tan(45°+A)=(cosA+sinA)/(cosA-sinA);
(cos9°+sin9°)/(cos9°-sin9°)=tan(45°+9°)=tan54°
Q.E.D
(cos9°+sin9°)/(cos9°-sin9°)=tan(45°+9°)=tan54°
Q.E.D
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