snowyinxue886
幼苗
共回答了13个问题采纳率:53.8% 举报
f(f(f(x)))=f(f(arc sin(cos(x))))=f(arcsin(cos(arc sin(cos(x)))))=arcsin(cos(arcsin(cos(arc sin(cos(x))))))=arcsin(cos(arcsin(cos(π/2-x))))=arcsin(cos(π/2-(π/2-x)))=arcsin(cos(x))
arcsin(cos(x+2π))=arcsin(cos(x))
f(f(f(x)))的最小正周期为:2π
1年前
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