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= ( (sin 0- cos0) / cos0) / (sin 0 + cos 0) / cos 0 x(sin 0 + cos 0) / sin 0 - cos 0) .
= (sin 0 - cos 0) / (sin 0 + cos 0) x (sin 0 + cos 0) / sin 0 - cos 0)
= (sin² 0 - cos² 0) / (sin² 0 - cos² 0)
= 1