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Difference between v5.2 and v7 and inability of v7 with trigonometric functions

• To: mathgroup at smc.vnet.net
• Subject: [mg119372] Difference between v5.2 and v7 and inability of v7 with trigonometric functions
• From: Rolf Schramek <subirolf at googlemail.com>
• Date: Wed, 1 Jun 2011 04:32:21 -0400 (EDT)

Can someone explain me the following behaviour of v7.
If there is a reason I might accept it.

v5.2:
(=CE=BB = =CF=80;
2/=CE=BB  Integrate[y0[x] Sin[n k x], {x, 0, =CE=BB}, Assumptions -> n =E2=
=88=88
Integers]
Output:
8 Sin[n =CF=80 /2] / (3 n^2 =CF=80^2)

v7:
(=CE=BB = =CF=80;
2/=CE=BB  Integrate[y0[x] Sin[n k x], {x, 0, =CE=BB}, Assumptions -> n =E2=
=88=88
Integers]
Output:
(2 ( 4 Sin[n =CF=80 /2]  - Sin[2 n =CF=80]  ) / (3 n^2 =CF=80^2)

Further Simplify gives same result as v5.2:
Simplify[%, , Assumptions -> n =E2=88=88 Integers]

But v7 seemes to be weaker and much slower with those terms.

??

Thank you