Hi I got a few probs with some integration questions such as

Integration by parts:

Limits [0,2] xsinh x dx

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Change of variable rule

Limits [-r,r] (r^2-x^2)^1/2 dx where x =rsint r>0

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and

Limits ["pie"/4, "pie"/2] (dx/sin x) using t = tan x/2)

Any kind of help is well appreciated

Thx