cython

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from cython.cimports.libc.math import sin
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@cython.cclass
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class Function:
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    @cython.ccall
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    def evaluate(self, x: float) -> float:
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        return 0
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@cython.cclass
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class SinOfSquareFunction(Function):
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    @cython.ccall
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    def evaluate(self, x: float) -> float:
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        return sin(x ** 2)
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