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