integral x^3(sqrt(16-x^2)dx
can someone check if my answer is right, (-1024/3)((sqrt(16-x^2)/(3)))^3+(1024/5)((sqrt(16-x^2)/(3)))^5+C

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May I ask what method of integration you chose?

first i used trig. sub. a-x^2, gives x=4sintheta, and then i used trig. integral of u-sub.

you could have done this with just an algebraic substitution

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