定积分在区间[0,π/2]∫[1/1+(tanx)^√2]dx

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/26 09:22:51
定积分在区间[0,π/2]∫[1/1+(tanx)^√2]dx定积分在区间[0,π/2]∫[1/1+(tanx)^√2]dx定积分在区间[0,π/2]∫[1/1+(tanx)^√2]dx注意一个结论:

定积分在区间[0,π/2]∫[1/1+(tanx)^√2]dx
定积分在区间[0,π/2]∫[1/1+(tanx)^√2]dx

定积分在区间[0,π/2]∫[1/1+(tanx)^√2]dx
注意一个结论:∫[0,π/2] f(sinx)dx=∫[0,π/2] f(cosx)dx (定积分换元法那里的一道例题)
则 ∫[0,π/2] f(sinx)dx=1/2[∫[0,π/2] f(sinx)dx+∫[0,π/2] f(cosx)dx]
∫[0,π/2][1/1+(tanx)^√2]dx
=∫[0,π/2][(cosx)^√2/[(cosx)^√2+(sinx)^√2]dx
=1/2{ ∫ [0,π/2][(cosx)^√2/[(cosx)^√2+(sinx)^√2]dx+∫[0,π/2] [(sinx)^√2/[(cosx)^√2+(sinx)^√2]dx }
=1/2∫[0,π/2] 1dx
=π/4