高数 不定积分 求大神
1个回答
2016-03-08
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∫(1,2) √(x²-1)/x dx
=∫(0,π/3) (tant/sect)dtant (令x=tant,dx=tant*sectdt)
=∫(0,π/3) tan²tdt
=∫(0,π/3) (sec²t-1)dt
=(tant-t)|(0,π/3)
=√3-π/3
=∫(0,π/3) (tant/sect)dtant (令x=tant,dx=tant*sectdt)
=∫(0,π/3) tan²tdt
=∫(0,π/3) (sec²t-1)dt
=(tant-t)|(0,π/3)
=√3-π/3
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