sin3α+sai5α=
cos4α-cos2α=
sin6α-sin2α=
cos7α+cosα=

sin3a + sai5a = (3ans + 5a `2 s) i *(2 как степень) cos4a - cos2a = 2 a c o s sin6a - sin2a = 4 a n s i cos7a + cosa = 8 a c o s