Question

★ Trigonometry ★

→ Prove that :

• $\boxed{\sf{tan⁴\theta \:+\: tan²\theta \:=\: sec⁴\theta \:-\: sec²\theta }}$

• $\boxed{\sf{\sqrt{\dfrac{sec \theta \:-\: 1 }{ sec \theta \:+\: 1 }} \:=\: cosec\theta \:-\: cot \theta }}$

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