Сравни числа

1. \(\sin\dfrac{\pi}{13}\) [ \(\gt\) | \(\lt\) | \(=\) ] \(\sin\dfrac{25\pi}{13}\) ;

2. \(\cos\dfrac{7\pi}{18}\) [ \(\gt\) | \(\lt\) | \(=\) ] \(\cos\dfrac{11\pi}{18}\) .