- Is it possible to make a hole in glass by using a torch?

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What is the difference between flow rate and flow velocity?? or it is the same thing? How do i find sin of theta? Find the maximum vertical distance between the line y=x+2 and the parabola y=4-x^2 on the interval [-2,1]? I have a new number cant log in? Sigma n = 1 to infinity cos^2na = 1/2(n + (cos(n+1)a sin n a / sina ))?