Ответы на вопрос:
1)х<5/2
2)x=1 x=4
3)x=26/3 x=-6
Объяснение:
1)3x-12+5x<2x+3
8x-12<2x+3
6x<15
x<5/2
2)5-2x=3
2x=8
x=4
5+2x=3
2x=2
x=1
1)cosπ/6cosx-sinπ/6sinx=1 cos(x+π/6)=1 x+π/6=2πn x=-π/6+2πn 2)2(√3/2cosx-1/2sinx)=1 2(cosπ/6cosx-sinπ/6sinx)=1 cos(x+π/6)=1/2 x+π/6=-π/3+2πn u x+π/6=π/3+2πn x=-π/2+2πn u x=π/6+2πn 3) sin(30-a)-cos(60-a)=sin30cosa-cos30sina-cos60cosa-sin60sina==1/2cosa-√3/2sina-1/2cosa-√3/2sina=-√3sina-√3sina=-√3sina
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