Indeed, using the fantastic qualities of the 6 trigonometric functions, we can generate various kinds of beautiful integrals. \\ ∫cos⁡x dx=sin⁡x+C\int \cos x \, dx = \sin x + C

∫sin⁡x dx=−cos⁡x+C\int \sin x \, dx = -\cos x + C

∫sec⁡2x dx=tan⁡x+C\int \sec^{2} x \, dx = \tan x + C

∫csc⁡2x dx=−cot⁡x+C\int \csc^{2} x \, dx = -\cot x + C

∫sec⁡xtan⁡x dx=sec⁡x+C\int \sec x \tan x \, dx = \sec x + C

∫csc⁡xcot⁡x dx=−csc⁡x+C\int \csc x \cot x \, dx = -\csc x + C \\ The 6 integrals above are just using the derivatives of the 6 trigonometric functions. Notice that only the integrals of sin⁡x\sin x and cos⁡x\cos x are here, leaving the other four trigonometric functions. Then what about their integrals? How many of all the 6 trigonometric functions have indefinite integrals that are compositions of the basic functions we covered already (e.g. logarithmic, exponential, absolute value, polynomial, factorial, trigonometric etc.)?

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