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 Nov30 revised Find all the triangles satisfying $\cos(A)\cos(B)+\sin(A)\sin(B)\sin(C)=1$ spelling correction; Nov30 revised Approximating a differentiable function by a polynomial title rectified Nov30 comment conversion of $\cos \theta$ = 0.248 without a calculator You might be forgetting that external users also browse this site and search for the questions. It really doesn't matter how old the question is, people will still find it. Nov30 comment Let $f_n(x)=nx(1-x^2)^n$ on $[0,1]$ for $n\ge1$. Find $f(x)= \lim f_n(x)$. Is this a convergence uniform? Question needs some serious mathjax edit. This is really ambiguous to even edit. Nov30 comment conversion of $\cos \theta$ = 0.248 without a calculator @Integrator It was just to maintain the quality of question. I hope you won't mind that. Nov30 revised conversion of $\cos \theta$ = 0.248 without a calculator changed 1.0471 -> 0.248 (as suggested by the user in the comment); 1.0471 not lie in the range of cos function (and user has just stated this numeral as an example so it's appropriate to change it to some suitable value) Nov30 suggested approved edit on Find all the triangles satisfying $\cos(A)\cos(B)+\sin(A)\sin(B)\sin(C)=1$ Nov30 suggested approved edit on Approximating a differentiable function by a polynomial Nov30 suggested approved edit on conversion of $\cos \theta$ = 0.248 without a calculator Nov30 revised Suppose that the area bounded by the curve $y = 3x^2 − 12x + 9$, the x-axis and the lines $x = 1$ and $x = k$ is 16. Find $k$. mathjax added; changed x=-1 to x=1 (as commented by the asker) Nov30 comment Suppose that the area bounded by the curve $y = 3x^2 − 12x + 9$, the x-axis and the lines $x = 1$ and $x = k$ is 16. Find $k$. Check the graph. This might help you. desmos.com/calculator/xrghc65aox . Quadratic function is passing through $x$-axis from $x=1$ and $x=3$. You'll have to break the limits accordingly. Nov30 suggested approved edit on Suppose that the area bounded by the curve $y = 3x^2 − 12x + 9$, the x-axis and the lines $x = 1$ and $x = k$ is 16. Find $k$. Nov30 suggested rejected edit on Suppose that the area bounded by the curve $y = 3x^2 − 12x + 9$, the x-axis and the lines $x = 1$ and $x = k$ is 16. Find $k$. Nov30 revised Arithmetic Progression Problem deleted 1 character in body Nov22 revised Arithmetic Progression Problem deleted 40 characters in body Nov22 awarded Notable Question Nov21 revised $\lim_{x \to \infty} x\sin(\frac{1}{x}) = 1$ (epsilon-delta like condition) Title edited; \text{sin}{...} -> \sin{...} Nov21 revised Expectation of the derivative of a random process Mathjax added. Nov21 revised Using Fourier analysis to show a function is positive Mathjax fixes; Images on web page affects it's loading time Nov21 revised Probability that one of a set of four points lies within the triangle formed by the other three Mathematical expressions rectified