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September 30, 2014

September 30, 2014

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

... Does anyone know what these are?

Thanks!

- trig -
**drwls**, Monday, April 7, 2008 at 12:37amI 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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