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= cos 72° + sin 72° * sin 36° / cos 36°
= cos 72° + (sin 72° * sin 36° / cos 36°)
= (cos 72° * cos 36° / cos 36°) + (sin 72° * sin 36° / cos 36°)
= cos (72° - 36°) / cos 36°
= cos 36° / cos 36°