What is the result of x2+3x−10x2+6x+5÷x−2x+1\frac{x^2+3x-10}{x^2+6x+5} \div \frac{x-2}{x+1}x2+6x+5x2+3x−10÷x+1x−2?
x−5x−1\frac{x-5}{x-1}x−1x−5
1
x+5x+5\frac{x+5}{x+5}x+5x+5
x−2x+1\frac{x-2}{x+1}x+1x−2