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The function ( y = f(x) ) satisfies the equation ( y = \cos(x + y) ). Find ( \fracdydx ) in terms of ( y ) and then prove that ( \fracd^2ydx^2 = -\frac\sin(x+y)(1+\sin(x+y))^3 ). Additionally, find the radius of curvature at the point where ( x = 0 ). problems in mathematics by v govorov pdf work
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