(1-x^2)^3开根号dx
问题描述:
(1-x^2)^3开根号dx
答
令x=sinu,则:u=arcsinx、cosu=√[1-(sinu)^2=√(1-x^2),dx=cosudu.∴∫√[(1-x^2)^3]dx=∫cosu√{[1-(sinu)^2]^3}du=∫cosu·(cosu)^3du=∫(cosu)^4du=(1/4)∫[2(cosu)^2]^2...dx/2x^2+3x-2