高中数学:cos(x+π⼀6)=4⼀5(x为锐角),则sinx?

2025-03-25 03:36:12
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回答1:

f(x)等于m?n等于 √3?sin(x/4)?cos(x/4) + 1?cos2(x/4) 等于(√3/2)?sin(x/2) + [1 + cos(x/2)]/2 等于(√3/2)?sin(x/2) + (1/2)?cos(x/2) + 1/2 等于sin(x/2 + π/6) + 1/2 ∴f(x)的最大值是1+1/2等于3/2 此时:x/2 + π/6等于2kπ + π/2 x/2等于2kπ + π/3 x等于4kπ + 2π/3,k∈Z