I have tried
sage: assume(0<u<pi/2)
But I still get
sage: simplify(1-cos(u)^2)
-cos(u)^2 + 1
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I have tried
sage: assume(0<u<pi/2)
But I still get
sage: simplify(1-cos(u)^2)
-cos(u)^2 + 1
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