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函数f(x)=cos1/4xcos(π/2-x/4)cos(π-x/2)在区间(0.+∞)内全部的极值点按从小到大排成数列an,求通项
人气:376 ℃ 时间:2020-09-16 11:00:52
解答
f(x)=cos(x/4)cos(π/2-x/4)cos(π-x/2)f'(x)=(1/2)cos(x/4)cos(π/2-x/4)sin(π-x/2)+ (1/4)cos(x/4)cos(π-x/2) sin(π/2-x/4)-(1/4)cos(π/2-x/4)cos(π-x/2)sin(x/4)= (1/2)cos(x/4)sin(x/4)sin(x/2)- (1/4)cos(...
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