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Uploaded on Dec 7, 2008
Easy way to memorize trigonometric functions
Many of you have pointed out that sohcahtoa is much easier to remember. This is is great for high school trig, but what about university level proofs? How do you use sohcahtoa to determine which identities multiply together to give sec(x)?
Also, a couple of you have mentioned cosh and sinh functions. FYI these functions are the complex analogues to cos and sin functions respectively. Specifically cosh(x) = cos(ix) and sinh(x) = -isin(ix), where i represent the immaginary unit (the square root of -1).