номер 1 -cos^2 p/12 + sin^2 p/12 номер 2 cos p/8 sin p/8

1-cos^2 p/12+sin^2 p/12 = 1-(cos^2 p/12 - sin^2 p/12 = 1 - cos 2p/12 =1 - cos p/6 = 1 - √3/2 = 2/2 - √3/2 = (2-√3)22 cos p/8 sin p/8 = sin 2p/8 = sin p/4 =√2/2