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Student Support Forum: 'Problems with Reduce' topicStudent Support Forum > General > "Problems with Reduce"

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balou
12/23/11 1:54pm

Hey everybody,

why is mathematica able to solve this:
Reduce[{Px == a[1] Cos[Th[1]] + a[2] Cos[Th[1] - Th[2]], Py == a[1] Sin[Th[1]] + a[2] Sin[Th[1] - Th[2]]}, {Th[1], Th[2]}]

but not this?
Reduce[{Px == a[1] Cos[Th[1]] + a[2] Cos[Th[1] - Th[2]], Py == a[1] Sin[Th[1]] + a[2] Sin[Th[1] - Th[2]], -Pi < Th[1] <= Pi, -Pi < Th[2] <= Pi}, {Th[1], Th[2]}]

What can I do to solve the second equation?
Thanks

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