已知函数f(x)=_/3cos^2x+sinxcosx-_/3/2,x
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已知函数f(x)=_/3cos^2x+sinxcosx-_/3/2,x
设角a的顶点在坐标原点,始边在x轴的非负半轴上,终边过点P(1/2,-_/3 /2)求f(a)的值,
2,讨论函数f(x)的基本性质
设角a的顶点在坐标原点,始边在x轴的非负半轴上,终边过点P(1/2,-_/3 /2)求f(a)的值,
2,讨论函数f(x)的基本性质
f(x)=√3cos^2x+sinxcosx-√3/2
=√3/2*(cos2x+1)+1/2*sin2x-√3/2
=√3/2cos2x+1/2sin2x
=sinπ/3cos2x+sin2xcosπ/3
=sin(2x+π/3)
tana=-√3
a=2kπ-π/3
f(a)=sin(4kπ-2π/3+π/3)=sin(-π/3)=-√3/2
=√3/2*(cos2x+1)+1/2*sin2x-√3/2
=√3/2cos2x+1/2sin2x
=sinπ/3cos2x+sin2xcosπ/3
=sin(2x+π/3)
tana=-√3
a=2kπ-π/3
f(a)=sin(4kπ-2π/3+π/3)=sin(-π/3)=-√3/2
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