Finding the fourth power of X of indefinite integral e: e ^ x ^ 4
e^x^4=y,e^x=y^(1/4);
e^xdx=y^(-3/4)dy/4=y^(1/4)dx
dx=y^(-3/4)dy/[4y^(1/4)]=dy(/4y)
∫e^x^4dx=∫ydy/(4y)=4y+C=4e^x^4+C
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