№1. Знайти значення виразу:

а) cos 107° cos17° + sin107° sin17°;

б) cos 36° cos24° - sin36° sin24°;

в) sin63° cos27° + cos63° sin27°;

г) sin51° cos21° – cos51° sin21°;

д) sin24° cos36° – cos24° sin(-36°).



№2. Спрости вираз:

А) sin (Alpha+Beta) + sin (aplha-beta);

Б) ;

В) sin(30° – aplha) + sin(30° + beta);



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