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**1. The problem statement, all variables and given/known data**

2 = c(1+sqrt(2)) + d(1-sqrt(2))

5 = c(1+sqrt(2))

^{2}+ d(1-sqrt(2))

^{2}

**3. The attempt at a solution**

Ive tried finding an expression for c, and replacing c in the other equation, but it gives me the wrong answer... what should i do?

The answer should be c=(sqrt(2)+2)/4

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