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f(x)=1−12cosx+1×32×4cos2x−1×3×52×4×6cos3x⋯ . f(x) = 1 - \dfrac{1}{2} \cos x + \dfrac{1 \times 3}{2 \times 4} \cos 2x - \dfrac{1 \times 3 \times 5}{2 \times 4 \times 6} \cos 3x \cdots. f(x)=1−21cosx+2×41×3cos2x−2×4×61×3×5cos3x⋯.
⌊10000×f(π3)⌋= ? \displaystyle \left \lfloor 10000 \times f\left( \dfrac{\pi}{3} \right) \right \rfloor = \ ? ⌊10000×f(3π)⌋= ?
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