Упростить.
1. cos(π + β) * sin(3/2π + β) - ctg(β - π) * ctg(3/2π - β)
2. sin(3/2π - α) * cos(π - α) + sin(3π - α) * cos(π/2 - α) + tg(π - α) * tg(3/2π + α)

Вычислить.
sin240° * cos(-330°) * tg(-315°) * ctg420°