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Úprava výrazu
Uprav následující výraz:
\( \large \Large \frac{\cos x-\cos y}{\sin x+\sin y}\large \)
\( \large -\Large \frac{\sin \left( \frac{x-y}{2} \right) }{\cos \left( \frac{x-y}{2} \right) }\large = -\tg \Large \frac{x-y}{2}\large \)
\( \large \Large \frac{\sin \left( \frac{x-y}{2} \right) }{\cos \left( \frac{x-y}{2} \right) }\large = \tg \Large \frac{x-y}{2}\large \)
\( \large \Large \frac{\cos \left( \frac{x-y}{2} \right) }{\sin \left( \frac{x-y}{2} \right) }\large = \cot \Large \frac{x-y}{2}\large \)
\( \large \Large \frac{\sin \left( x+y \right) }{\cos \left( x+y \right) }\large = \tg \Large (x+y)\large \)