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Řešení - Trigonometry

- \frac{1}{2}

-\frac{1}{2}

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The period of trigonometric functions is 360 degrees.

$\cos (1920 °) = \cos (1920 - 360 °)$

Subtracting one integer from another.

$\cos (1920 - 360 °) = \cos (1560 °)$

The period of trigonometric functions is 360 degrees.

$\cos (1560 °) = \cos (1560 - 360 °)$

Subtracting one integer from another.

$\cos (1560 - 360 °) = \cos (1200 °)$

The period of trigonometric functions is 360 degrees.

$\cos (1200 °) = \cos (1200 - 360 °)$

Subtracting one integer from another.

$\cos (1200 - 360 °) = \cos (840 °)$

The period of trigonometric functions is 360 degrees.

$\cos (840 °) = \cos (840 - 360 °)$

Subtracting one integer from another.

$\cos (840 - 360 °) = \cos (480 °)$

The period of trigonometric functions is 360 degrees.

$\cos (480 °) = \cos (480 - 360 °)$

Subtracting one integer from another.

$\cos (480 - 360 °) = \cos (120 °)$

Reflecting the number with respect to 360 degrees.

$\cos (120 °) = \cos (180 - 60 °)$

Reflecting the cosine function with respect to 180 degrees.

$\cos (180 - 60 °) = - \cos (60 °)$

Computing the cosine of 60 degrees.

$- \cos (60 °) = - \frac{1}{2}$

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