Can someone plz help me evaluate these integrals? integral( e^x(3 + e^x)^8 )dx integral(PI/6 PI/4) (sin(x)/(1+cos(x))^2)dx
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In both cases you can find a primitive quite quickly. Observe that , so the chain rule yields, for a well-behaved function : . In particular, choosing : . Consequently . Try applying the same method to the second one
Originally Posted by Sally_Math Can someone plz help me evaluate these integrals? integral( e^x(3 + e^x)^8 )dx integral(PI/6 PI/4) (sin(x)/(1+cos(x))^2)dx Let Change the limits using our substitution: Which should be easy enough to solve
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