Today we will consider a cotangent of 210 degrees. We will draw a unit disk and we will write values of cotangents. Here what turned out.
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| The unit circle and cotangent |
Value of a cotangent of 210 degrees same, as at a cotangent of 30 degrees. We take mathematics in hand and we check. The cotangent is the cosine divided into a sine. Values of a sine and cosine of 30 and 210 degrees can be taken
here.
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| Cotangent 210 degrees |
We already know
how to divide fraction into fraction. Formulas of transformation of angles of trigonometric functions.
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| Formulas of transformation of angles |
These formulas will be very useful to you.
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