Shoutbox

quote:

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Originally posted by ipab
perhaps this will aid him in remembering it better

soh cah toa

sine=opposite/hypotenuse
cosine=adjascent/hypotenuse
tangent=opposite/adjascent

hope this helps .

the A is just a variable. It cancels out of this equation.

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I have a better way ... well i had two but i cant remember one as i never used it ....

OAO
HHA

Sine cosine Tan

And we all know the other 3 are reciprocals of the first three

Say it like "O-A-O upon (divided by) H-H-A"

Hence Sine = O/H; Cosine = A/H and Tan (Tangent) = O/A

So obviously for Cosecant, Secant and Cotangent read it the other way round (ie the bottom 3 first .....) or just remember Cosecant = 1/Sine



Sin (2x) = 2 Sin (x) . Cos (x)
tanh^(-1) (x) = (1/2) * log [(1+x)/(1-x)]


</trigonometry mode>