高中数学三角函数 求化简
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化成Asin(ωx+φ)的形式。
y=(1-cos2x)/2+1/2 sin2x +cos2x
=1/2 (sin2x+cos2x)+1/2
=√2/2 sin(2x+π/4) +1/2,
f(π/3)=√2/2 sin(2π/3+π/4) +1/2=(1+√3)/4,
2.
π/12≤x≤π/4,5π/12≤(2π/3+π/4≤3π/4, (1+√3)/4≤sin(2x+π/4)≤1,
(√2+√6 +4)/8≤f(x)≤(1+√2)/2.
y=(1-cos2x)/2+1/2 sin2x +cos2x
=1/2 (sin2x+cos2x)+1/2
=√2/2 sin(2x+π/4) +1/2,
f(π/3)=√2/2 sin(2π/3+π/4) +1/2=(1+√3)/4,
2.
π/12≤x≤π/4,5π/12≤(2π/3+π/4≤3π/4, (1+√3)/4≤sin(2x+π/4)≤1,
(√2+√6 +4)/8≤f(x)≤(1+√2)/2.
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