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Identitas Trigonometri.Nomor 1
(1 - tan² θ) / (1 + tan² θ)
= (1 - sin² θ / cos² θ) / (1 + sin² θ / cos² θ)
= (cos² θ - sin² θ) / (cos² θ + sin² θ)
= (cos² θ - sin² θ) / 1
= cos² θ - sin² θ
Terbukti.
Nomor 2
sec² A cot A / csc² A
= (1 / cos² A)(cos A / sin A) / (1 / sin² A)
= sin² A / (cos A sin A)
= sin A / cos A
= tan A
Terbukti.