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Sine and cosine functions have periods of:

2π

Tangent functions have periods of:

π

How do you convert radians to degrees?

(Radians x 180) / π

How do you convert degrees to radians?

(Degrees x π) / 180

What do you do with the number before the x in a function to find the period?

Put it under π or 2π, depending on the function.

How do you find the tangent of an angle?

Tanx = (sinx/cosx)