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Q. Evaluate
- Understand Convergence Behavior: Understand the series and its convergence.We are asked to evaluate the sum of a series where each term is , with starting from and going to infinity. We need to consider the behavior of the sine function and the factorial function to understand the convergence of this series.
- Analyze Sine Function: Analyze the behavior of the sine function. The sine function oscillates between and . When we take the sine of the sine function, the result will still be between and . This is because the sine function is periodic with a period of and the output range is from to .
- Consider Factorial in Sine: Consider the factorial function within the sine. The factorial function grows very rapidly. As increases, will become very large. Since the sine function is periodic, will oscillate between and , but the exact value will be difficult to predict without calculation.
- Evaluate Term for : Evaluate the term for . For , the term is . Since is a small positive number, will also be a small positive number. Therefore, is just .
- Recognize Pattern for Larger : Recognize the pattern for larger . For , we have to consider that will be an integer. The sine of an integer factorial can be any value between and , but as increases, will be a very large number, and will be very difficult to predict. However, since is an integer, will be a real number between and raised to an integer power.
- Realize Simplification for Large : Realize the simplification for large . As becomes very large, will be an even larger integer, and will oscillate between and . However, for greater than , the sine of a very large number will be very close to zero due to the periodic nature of the sine function. Therefore, will be very close to for large .
- Consider Power of Zero: Consider the power of zero. When is large, is close to zero, and raising a number very close to zero to a large power will result in a number that is even closer to zero. Therefore, for large , the terms of the series will be very close to zero.
- Conclude Series Convergence: Conclude the convergence of the series.Since the terms of the series approach zero as becomes large, the series converges. The sum of the series will be dominated by the first few terms, as the later terms will contribute very little to the sum.
- Calculate Series Sum: Calculate the sum of the series.To calculate the sum of the series, we would need to evaluate each term for starting from and going to infinity. However, this is not practical to do by hand for all terms, and a numerical method or software would be required to find an approximate sum.
- Recognize Problem Limitations: Recognize the limitations of the problem. Without numerical computation, we cannot find the exact sum of the series. We can only state that the series converges and that the sum is dominated by the first few terms. For an exact answer, numerical methods or software would be needed.
