I tried substitution but it didn't work. please help. thanks
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Change of variable t=(1+x2+x4)
dt = ( ? ? ? )dx
this is what i did: let u=1+x^2+x^4 . then i tried u substitution. u'= 2x +4x^3 but wasn;t sure what (???)dx would be.
the answer however is 1/23 ( 1+x^2+x^4)^46 + c
du = (u')dx
Hey! I gave the same answer in your other thread pls help to find integral.
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