Posted by **jennifer** on Monday, April 7, 2008 at 12:20am.

I have heard that trig CAN be super easy, that there are just, like, 10 rules you need to memorize then all the problems are easy.

... Does anyone know what these are?

Thanks!

- trig -
**drwls**, Monday, April 7, 2008 at 12:37am
I would say they are the definitions of tan, cot, sec and csc in terms of sin and cos,

tan = sin/cos

cot = cos/sin

csc = 1/sin

sec = 1/cos

sin^2 + cos^2 = 1

the law of sines

the law of cosines

sin (a + b) = sin a cos b + cos b sin a

cos (a + b) = cos a cos b - sina sin b

tan (a + b) =

(tan a + tan b)/[1 -(tan a tan b)]

Others may differ

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