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Find an expression for x such that: sqrt(2)*sin(x+pi/4)-1-x+(x^2)/2 = -epsilon/6, where epsilon is very small.

Find an expression for x such that:
sqrt(2)*sin(x+pi/4)-1-x+(x^2)/2 = -epsilon/6,

Where epsilon is very small.

Do not need the exact value of x, but an approximation using Taylor expansion.

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