Trig and trig functions
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Period
= 1 cycle
cosine graph
starts at 1, goes down to 0 (at pi over 2), goes to -1 (at pi)
sine wave
One in which amplitude varies in proportion to the sine function of an angle.
Periodic functions
a function with a pattern that repeats exactly throughout its domain
Radian
a unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius.
trig function equation
amplitude is ALWAYS positive