1)3sin²π÷2-4tg²π÷4-3cos²π÷6+3ctg²π÷2 2)tg5π÷4×sinπ÷3-cos7π÷6×sin3π÷2
3)sinα=3÷4,0≤α≤π÷2
4)ctgα=2÷3,π≤α≤3π÷2
5)ctgα-cosα-1÷sinα
6)(sinβ×ctgβ)²+(cosβ×tgβ)2
3)sinα=3÷4,0≤α≤π÷2
4)ctgα=2÷3,π≤α≤3π÷2
5)ctgα-cosα-1÷sinα
6)(sinβ×ctgβ)²+(cosβ×tgβ)2
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