# user3.1415

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bio website location age 19 member for 2 years, 8 months seen Apr 18 at 9:11 profile views 24

# 8 Questions

 7 Proof: $\mathrm{adj}(\mathrm{adj}(A)) = (\mathrm{det}(A))^{n-2} \cdot A$ for $A \in \mathbb{R}^{n\times n}$ 4 Trigonometric equality $\cos x + \cos 3x - 1 - \cos 2x = 0$ 2 Prove: if $A(x)$ is divisible by $(x-a)^m$, its derivative is divisible by $(x - a)^{m-1}$ 2 Finding a particular solution to a non-homogeneous system of equations 2 Proof: $CA = I_n$ and $AD = I_m \Rightarrow C = D$

# 252 Reputation

 +10 Proof: $\mathrm{adj}(\mathrm{adj}(A)) = (\mathrm{det}(A))^{n-2} \cdot A$ for $A \in \mathbb{R}^{n\times n}$ +5 Finding a particular solution to a non-homogeneous system of equations +10 Prove: if $A(x)$ is divisible by $(x-a)^m$, its derivative is divisible by $(x - a)^{m-1}$ +10 Plotting a quadratic equation in the $\,xy\,$- plane

 3 A logic problem 1 Plotting a quadratic equation in the $\,xy\,$- plane

# 10 Tags

 3 logic 0 divisibility 1 graphing-functions 0 derivatives 0 linear-algebra × 6 0 transformation 0 matrices × 3 0 determinant 0 trigonometry 0 factoring

# 5 Accounts

 Stack Overflow 2,241 rep 11330 Mathematics 252 rep 111 Programmers 168 rep 17 Super User 101 rep 1 Ask Different 101 rep 1