f(x)=2根号3sinx*cosx+cos2x-1(x属于R);(1)求函数y=f(x)的单调递增区间;(2)若x属于【-5π/12,π/3】,求f(x)的取值范围

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f(x)=2根号3sinx*cosx+cos2x-1(x属于R);(1)求函数y=f(x)的单调递增区间;(2)若x属于【-5π/12,π/3】,求f(x)的取值范围
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f(x)=2根号3sinx*cosx+cos2x-1(x属于R);(1)求函数y=f(x)的单调递增区间;(2)若x属于【-5π/12,π/3】,求f(x)的取值范围
f(x)=2根号3sinx*cosx+cos2x-1(x属于R);(1)求函数y=f(x)的单调递增区间;
(2)若x属于【-5π/12,π/3】,求f(x)的取值范围

f(x)=2根号3sinx*cosx+cos2x-1(x属于R);(1)求函数y=f(x)的单调递增区间;(2)若x属于【-5π/12,π/3】,求f(x)的取值范围
f(x)=2√3sinx*cosx+cos2x-1
=√3sin2x+cos2x -1
=2sin(2x+ π/3)-1
y=f(x)的单调递增区间
即 2kπ- π/2≤2x+ π/3≤ 2kπ-+π/2
kπ- 5π/12≤x≤ kπ-+π/12 k∈z
2)若x属于【-5π/12,π/3】
令k=0
x∈[-5π/12, π/12]递增
故f(-5π/12)= -3
f(π/12)= -1
f(x)的取值范围 【-3,-1】

这是常规题目,首先求导,列表,判断区间
孩子这种题目要自己多锻炼,靠自己做,我不帮你算了