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How can I realize a dynamic solution?

The first variable slider should be simply d and the second a Cos [x degrees]?

Slider[Dynamic[angle], {0., 90.} Degree]

Slider[Dynamic[distance], {0, 1000.}]

Dynamic[distance]/ Cos[Dynamic[angle] ]

... does not work.

The solution will give

830. Sec[1.428] for example.

How can I solve the problem?

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# Mathematica 7

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