Mathematics

Mathematics

Problem

Let g(x)=f(x)sin⁡xg(x)=f(x)\sin x, where f(x)f(x) is a twice differentiable function on (−∞,∞)(-\infty,\infty) such that f′(−π)=1f'(-\pi)=1. The value of ∣g′′(−π)∣|g''(-\pi)| equals.....

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