Question

Формулы приведения ПОМОГИТЕ РЕШИТЬ!!!!
Упростить:
1.

1) tg(360°-α)+ctg(270°-α)+tg(180°-α)+ctg(90°-α)

2)sin⁡(π/2+α)+cos⁡(π+α)+tg(3π/2-α)+ctg(2π-α)

2.

1) sin⁡(90°+α)∙sin⁡(180°-α)∙[tg(180°+α)+tg(270°-α)]

5.

1)(sin⁡(3π/2+α) ∙tg(π/2+β))/(cos⁡(π-α)∙ctg(3π/2-β))-(sin⁡(3π/2-β)∙ctg(π/2+α))/(cos⁡(2π-β)∙tg(π+a))

2)(cos⁡(π+α)∙ctg(π-α))/(sin⁡(3π/2+α)∙tg(π/2-α))-(cos⁡(π-α)∙tg(2π-α))/(sin⁡(π/2+α)∙ctg(3π/2-α))