\sin ( \pi 16 ) ( \frac{ 100(x-125)(x-1) }{ 21 }
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\sin(\pi \times 16)\times \frac{\left(100x-12500\right)\left(x-1\right)}{21}
Use the distributive property to multiply 100 by x-125.
\sin(\pi \times 16)\times \frac{100x^{2}-12600x+12500}{21}
Use the distributive property to multiply 100x-12500 by x-1 and combine like terms.
\frac{\sin(\pi \times 16)\left(100x^{2}-12600x+12500\right)}{21}
Express \sin(\pi \times 16)\times \frac{100x^{2}-12600x+12500}{21} as a single fraction.
\frac{100\sin(\pi \times 16)x^{2}-12600\sin(\pi \times 16)x+12500\sin(\pi \times 16)}{21}
Use the distributive property to multiply \sin(\pi \times 16) by 100x^{2}-12600x+12500.
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