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# Integration Review Solutions

Divide x by x + 7 using long division. The quotient is 1 and the remainder -7.

Use integration by parts: .

Use a u-substitution:

Use a u-substitution:

Use integration by parts:
.

Now use integration by parts again for

Put everything together:

Use partial fractions.

Plug in t = -3 to see that . Plug in t = 4 to see that .

Divide t^{2} + 2 by t + 2 using long division. The quotient
is t - 2 and the remainder is 6.

Use a u-substitution. u = 2y + 1 du = 2 dy

Use integration by parts multiple times, or use the D/I
chart. In the first integration

by parts iteration, u = t^{3} and dv = e^{t} dt. Therefore, put t^{3} in the D column and
put e^{t} in

the I column. The letter D stands for derivative and I for integral. Fill in the
columns

accordingly until you get to a 0.

Draw diagonal arrows and label with alternating positive
and negative signs. Multiply

along the diagonals, and add or subtract the resulting terms depending on the
sign of the

arrow. Don't forget to add C.

Use integration by parts: .

Use a trig. substitution:

If we are careful, we see that this integral equals
. Let's assume for now

that cosθ > 0. Is this assumption valid? Think about the range of θ in the
substitution.

Use trig. identities to simplify.

From our substitution 2t = sinθ , we deduce:

Use partial fractions.

Substitute y = 1 to see that and y = -1 to see that .

Do a z-substitution, then do integration by parts. .