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发表于 2013-8-11 14:47:02
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来自 北京
本帖最后由 chyanog 于 2013-8-11 17:05 编辑
Mathematica解法
- Solve[{a^2 + b^2 + 169 + Sqrt[c - 13] - 24 a - 10 b == 0},
- {a, b, c}, Reals]
- Solve[{a^2 + b^2 + 169 + Sqrt[c - 13] - 24 a - 10 b == 0,
- a > 0, b > 0, c > 0},{a, b, c}]
- Solve[{1/Cos[a]^2 + 1/(Sin[a]^2 Sin[b]^2 Cos[b]^2) == 9,
- x == Tan[a], y == Tan[b], 0 < a < Pi/2, 0 < b < Pi/2}, {x, y}, {a, b}]
- {x, y} /. % // ArcTan
- Solve[{1/Cos[x]^2 + 1/(Sin[x]^2 Sin[y]^2 Cos[y]^2) == 9,
- 0 < x < Pi/2, 0 < y < Pi/2} // Simplify,{x, y}, Algebraics] // FullSimplify
- % /. k_*ArcTan[x_] :> ArcTan@TrigExpand@Tan[k ArcTan[x]] // FullSimplify
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