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