![]() ![]() Currently this cheat sheet is 4 pages long. A unit circle (completely filled out) is also included. 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. Trig Cheat Sheet - Here is a set of common trig facts, properties and formulas. ![]() Actually, this only works if x is positive. Using the area formula for a sector (from the previous page) and the area formula for a triangle (from heart), this becomes 1 2 ·cos2(x)·x 1 2 ♱·sin(x) 1 2 ♱2 ·x. Then the derivatives of $\cos$, $\cot$, and $\csc$ can be memorised with not much more effort. 150 Limits of Trigonometric Functions Area of sector OAB Area of triangle OCP Area of sector OCP. Here is a trick I use to remember the derivatives and antiderivatives of trigonometric functions. It includes the following trig laws and identities: Law of Sines, Law of Cosines, Law of Tangent, Mollweids Formula, Trig Identities, Tangent and Cotangent Identities, Reciprocal Identities, Pythagorean Identities, Even and Odd Identities, Periodic Identities, Double Angle Identities, Half Angle Identities, Sum and Difference Identities, Produc.
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