Řešení - Trigonometry

- \cos (80 °)

-\cos(80\degree)

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Reflecting the number with respect to 360 degrees.

$\cos (260 °) = \cos (360 - 100 °)$

The period of trigonometric functions is 360 degrees.

$\cos (360 - 100 °) = \cos (360 - 100 - 360 °)$

Removing or simplifying the same numbers on the top and bottom of a fraction.

$\cos (360 - 100 - 360 °) = \cos (- 100 °)$

Computing the cosine of a negative angle.

$\cos (- 100 °) = \cos (100 °)$

Reflecting the number with respect to 360 degrees.

$\cos (100 °) = \cos (180 - 80 °)$

Reflecting the cosine function with respect to 180 degrees.

$\cos (180 - 80 °) = - \cos (80 °)$

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Goniometrie propojuje úhly, délky a periodické děje v matematice i fyzice.