# Graphing Waves

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In these two videos we learn how to graph waves using trigonometric functions.

# Graphs of Sine and Cosine

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In these videos we learn about the graphs of sin(x) and cos(x).

# Reciprocal Trig Ratios

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In this video we learn three new trig ratios called the reciprocal ratios. (secant,cosecant,and cotangent)

# Unit Circle Part 2

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More about why the unit circle is useful.

# The Unit Circle

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In this video I introduce the unit circle.

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A radian is a unit of measuring angles just like a degree is. A radian is a distance on the circle’s circumference which is equal to 1 radius.

This means there are $2\pi$ radians in one circle or that $2\pi$ radians equals 360 degrees.

If $2\pi$ radians equals 360 degrees that means that 1 degree equals $2\pi$ divided by 360 radians or $\pi$ divided by 180 radians.

1 radian = $\frac{180}{\pi}$ degrees

1 degree = $\frac{\pi}{180}$ radians

This is a degrees and radians chart. If 1 degree = $\frac{\pi}{180}$radians then 30 degrees equals 30 times that or $\frac{\pi}{6}$ radians. The same thing can be done to find the radian measure for other angles.