Derivative Of Sec(x) By The First Principle |Ab Initio Method| |Calculus| |Formula Foundation|

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If You Worry About The Derivative Of Sec X By First Principle (Ab Initio Method) Then Watch The Complete Video It Will Provide The General Concept Of Ab Initio Method…

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The formula you used was wrong
CosA - cosB = -2 sin ()sin()

sardarwali