∫上π/4下-π/4(1+x^2013)tan^2xdx

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∫上π/4下-π/4(1+x^2013)tan^2xdx∫上π/4下-π/4(1+x^2013)tan^2xdx∫上π/4下-π/4(1+x^2013)tan^2xdx因为x^2013*tan^2(x

∫上π/4下-π/4(1+x^2013)tan^2xdx
∫上π/4下-π/4(1+x^2013)tan^2xdx

∫上π/4下-π/4(1+x^2013)tan^2xdx
因为x^2013*tan^2(x)是奇函数,所以那个积分为0
所以原式=∫(-π/4→π/4)tan^2(x)dx
=∫(-π/4→π/4)(sec^2(x)-1)dx
=(tanx-x)|(-π/4→π/4)
=2-π/2