TheJoker
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 Oct11 comment Sets forming orthonormal basis but how can you ensure that it spans the vector space?? Oct11 revised Probability mass function and conditional probabilities added 182 characters in body Oct11 answered Sets forming orthonormal basis Oct11 answered Probability mass function and conditional probabilities Oct11 comment Probability mass function and conditional probabilities Just integrate the product w.r.t. $x$ to getthe answer. It is standard way to find marginal density from joint density. Oct11 comment Probability mass function and conditional probabilities Also there is a typo by you, $p_X(x) \cdot p_{Y|X}(y|x)=p_{X,Y}(x,y)$ and not the way you wrote. Oct11 comment Linear Algebra Vectors $2$ points are sufficient to determine a line. You've got two points. If both points satisfy both lines, it means the lines are same as there is a unique line passing through two distinct points. Oct11 suggested rejected edit on Closed form for summation involving binomial coefficients. Oct11 comment $(m-n\cos y)(m+n\cos x)=m^2 -n^2$ then find $\frac{dy}{dx}$ Hi, Welcome to math.SE.Asking questions is fine, though I can't understand why you need to give unnecessary details about your class,etc. Also you wouldn't have asked for solution if you were not stuck. Please consider changing your title. Oct10 revised An angle $\theta$ can be trisected if and only if $4x^3-3x+\cos\theta$ is reducible over $\mathbb{Q}(\cos\theta)$ added 110 characters in body Oct10 revised An angle $\theta$ can be trisected if and only if $4x^3-3x+\cos\theta$ is reducible over $\mathbb{Q}(\cos\theta)$ added 309 characters in body Oct10 revised An angle $\theta$ can be trisected if and only if $4x^3-3x+\cos\theta$ is reducible over $\mathbb{Q}(\cos\theta)$ misinterpreted the question Oct10 answered An angle $\theta$ can be trisected if and only if $4x^3-3x+\cos\theta$ is reducible over $\mathbb{Q}(\cos\theta)$ Oct9 answered Distribution of Poisson variable conditional on a Gamma variable Oct9 awarded Critic Oct8 revised Where are we using $C^1$ in this proof? error, completely flawed argument. Oct8 comment Where are we using $C^1$ in this proof? yes, sorry. I'll edit my post. Thanks. Oct8 comment Where are we using $C^1$ in this proof? No I wrote, complex differentiability $\iff$ Cauchy Riemann. It is true. Complex differentiability does not imply analyticity. Also the function is right example. Consider $z$ tending to zero with $arg (z) = \frac {\pi}{4}$. Oct8 answered Where did $\lambda$ come from? Oct8 revised Where are we using $C^1$ in this proof? example supporting my statement