sin 11п/6*cos13п/6*tg5п/4*ctg5п/3 sin5a-sina __________ *tg3a cos5a-cosa

1) $sin\frac{11\pi}{6}*cos\frac{13\pi}{6}*tg\frac{5\pi}{4}*ctg\frac{5\pi}{3}=sin(2\pi-\frac{\pi}{6})*cos(2\pi+\frac{\pi}{6})*tg(\pi+\frac{\pi}{4})*ctg(2\pi-\frac{\pi}{3}) = -sin\frac{\pi}{6}*cos\frac{\pi}{6}*tg\frac{\pi}{4}(-ctg\frac{\pi}{3})=\frac{1}{2}*\frac{\sqrt{3}}{2}*1*\frac{1}{\sqrt{3}}=\frac{1}{4}$

2) $\frac{sin5a-sina}{cos5a-cosa}tg3a=\frac{2sin2a*cos3a}{-2sin3a*sin2a}*tg3a=-ctg3a*tg3a = -1$