设函数f(x)=2x-cosx,an是公差为八分之pai的等差数列,f(a1)+f(a2)+…+f(a5)等于5pai,则f(a3)的平方减a1*a3等于几
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设函数f(x)=2x-cosx,an是公差为八分之pai的等差数列,f(a1)+f(a2)+…+f(a5)等于5pai,则f(a3)的平方减a1*a3等于几
设函数f(x)=2x-cosx,an是公差为八分之pai的等差数列,f(a1)+f(a2)+…+f(a5)等于5pai,则f(a3)的平方减a1*a3等于几
设函数f(x)=2x-cosx,an是公差为八分之pai的等差数列,f(a1)+f(a2)+…+f(a5)等于5pai,则f(a3)的平方减a1*a3等于几
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