第九第十小题求过程 50
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1.f(x)=(coswx)^2 + √3sinwxcoswx=1/2+(cos2wx)/2+ (√3/2)sin2wx=1/2+sin(2wx+π/6)
所以周期T=2π/2w=2π,得w=1/2; f(x)=1/2+sin(x+π/6)
当2kπ-π/2<=x+π/6<=2kπ+π/2,即2kπ-2π/3<=x<=2kπ+π/3 时f(x)为增函数;
所以f(x)的但调增区间为[2kπ-2π/3,2kπ+π/3];
2.f(x)的图像的对称轴为2wx+π/6=kπ+π/2; 即x=kπ/2w+π/6w=π/6,得w=3k+1m而0<w<2
所以w=1
所以周期T=2π/2w=2π,得w=1/2; f(x)=1/2+sin(x+π/6)
当2kπ-π/2<=x+π/6<=2kπ+π/2,即2kπ-2π/3<=x<=2kπ+π/3 时f(x)为增函数;
所以f(x)的但调增区间为[2kπ-2π/3,2kπ+π/3];
2.f(x)的图像的对称轴为2wx+π/6=kπ+π/2; 即x=kπ/2w+π/6w=π/6,得w=3k+1m而0<w<2
所以w=1
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