高中数学,过程详细,发图 10
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1) f(x)=√3/2*sinx+1/2*cosx=sin(x+π/6)
2kπ-π/2<2kπ+π/2<2kπ+π/2, 2kπ-2π/3<x<2kπ+π/3,(k∈Z)为增区间
2kπ+π/2<2kπ+π/6<2kπ+3π/2,2kπ+π/3<x<2kπ+4π/3(k∈Z)为减区间
2) f(B+C)=sin(B+C+π/6)=1, B+C+π/6=π/2, B+C=π/3
A=2π/3, a/sinA=b/sinB, √3/(√3/2)=1/sinB, B=π/6
所以C=π/6
2kπ-π/2<2kπ+π/2<2kπ+π/2, 2kπ-2π/3<x<2kπ+π/3,(k∈Z)为增区间
2kπ+π/2<2kπ+π/6<2kπ+3π/2,2kπ+π/3<x<2kπ+4π/3(k∈Z)为减区间
2) f(B+C)=sin(B+C+π/6)=1, B+C+π/6=π/2, B+C=π/3
A=2π/3, a/sinA=b/sinB, √3/(√3/2)=1/sinB, B=π/6
所以C=π/6
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