# How to Prove Trigonometric Identities Sec2A – Tan2A = 1 Proof

Hi Friends, In this video we are going to learn another very important trigonometry identity which Sec^2X + Tan^2X = 1. This identity will be very helpful in future so keep in mind and see we derive this formula too.

I hope you understand the concept hidden inside this trigonometry identity or formula. Now lets learn next level trigonometry tutorial videos.

**28. Trigonometry Identity Cosec2A – Cot 2A = 1 Proof**

**29. Trigonometric Identity Problems – Writing SinA, CosA etc in CotA – Type 1**

**30. Trigonometric Identity Problems- Writing All Trigonometric Ratios in SecA – Type 2**

**31. Trigonometric Identities Problems – Evaluating -Type 3**

**31. Trigonometric Identities Proving Problems -1**

**32. Trigonometric Identities Proving Problems – 2**

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