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continuous growth
A(t)=Pe^rt
exponential decay (cooling
Ts+(Ti-Ts)e^-kt
Reference Angle in Quadrant 2
π-Ø
Reference Angle in Quadrant 3
Ø-π
Reference Angle in Quadrant 4
2π-Ø
Reference Angle in Quadrant 1
Ø
cos(60)
1/2
cos(30)
√3/2
cos(45)
√2/2
sin(30)
1/2
sin(45)
√2/2
sin(60)
√3/2
Coterminal formula
Subtract 2π until less than 2π but greater than 0 (0<x<2π)