求不定积分∫dx/根号下(1-2x^2),

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求不定积分∫dx/根号下(1-2x^2),

求不定积分∫dx/根号下(1-2x^2),
求不定积分∫dx/根号下(1-2x^2),

求不定积分∫dx/根号下(1-2x^2),

答:
∫ [1/√(1-2x^2)] dx 设x=(√2/2)sint,-π/2=∫ (1/cost) d [(√2/2)sint ]
=(√2/2) ∫ (cost/cost) dt
=(√2/2) t +C
=(√2/2)arcsin(√2x)+C

解:
设x=sint/根号2,t=arcsin根号2x,dx=1/根号2costdt
∫1/根号2costdt/cost
=∫1/根号2dt
=1/根号2t
=1/根号2arcsin根号2x