Формулы (синус и косинус суммы и разности):
1) cos107*cos17+sin107*sin17= cos(107-17) = cos90 = 0
2) cos36*cos24-sin36*sin24= cos(36+24) = cos60 = 1/2
3) sin63*cos27+cos63*sin27= sin(63+27) = sin90 = 1
4) sin51*cos21-cos51*sin21= sin(51-21) = sin30 - 1/2