![]() ![]() These functions have the prefix co- in them for a reason: cosine is the sine of the co-angle, cotangent is the tangent of the co-angle, and cosecant is the secant of the co-angle. Then the derivatives of $\cos$, $\cot$, and $\csc$ can be memorised with not much more effort. ![]() The most basic identity is the Pythagorean Identity, which is derived from the Pythagoras Theorem. There are many identities which are derived by the basic functions, i.e., sin, cos, tan, etc. These identities are true for any value of the variable put. Here is a trick I use to remember the derivatives and antiderivatives of trigonometric functions. PDF Trigonometric identities are mathematical equations which are made up of functions. Vidyakul provides FREE PDF Download for CBSE Class 11 Math Chapter 3 Trigonometric Functions Formulae prepared by expert math teachers according to the.
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