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Pythagrean
Sin²x + Cos²x =1
Double angle (sin)
Sin2x = 2SinxCosx
Double angle (cos)
Cos2x = Cos^2x-Sin^2x
Sum / Difference (sin)
Sin(x +- y) = SinxCosy +- CosxSiny
Sum / Difference (cos)
Cos(x +- y) = CosxCosy -+ SinxSiny
“Invertible”
Passes horizontal line test
Tan Period
pi
Parent Function of any trig equation
Atrig(B(x-C))+D
Sec
1/Cos
Csc
1/sin
Cot
Cos/Sin
Period of sin and cosine
2pi
Period of Sec and Csc
2pi
Period of Cot
pi