# Jlamprong

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Only a newbie in Mathematics

 12 A calculus problem with functions such that $f''(x) = g(x)$ and $g''(x) = f(x)$ 12 If $(A + I)^4 = 0$, $A$ is non-singular 9 Prove by induction that (5^(n))-1 is divisible by 4 for all natural numbers n. 8 Proving $\frac{\sin x + \sin 2x + \sin3x}{\cos x + \cos 2x + \cos 3x} = \tan2x$ 8 Multiple integral of min

# 1,189 Reputation

 +5 nice name for the image of multivariable function +10 Inequality proof by induction, what to do next in the step +95 Proving $\frac{\sin x + \sin 2x + \sin3x}{\cos x + \cos 2x + \cos 3x} = \tan2x$ +5 Projection function preserving distance

# 64 Questions

 9 Solution of differential equation related to Normal density 5 Existence of a bounded function satisfying a second order differential equation 5 Extended matrix function 4 Distribution related to brownian bridge 3 Boundedness of an integral of square function implying zero integral

# 100 Tags

 40 linear-algebra × 34 15 exponential-function × 4 34 calculus × 14 13 algebra-precalculus × 7 23 matrices × 26 12 inequality × 9 21 real-analysis × 28 12 differential-equations × 6 18 functions × 14 12 systems-of-equations

# 4 Accounts

 Mathematics 1,189 rep 217 English Language & Usage 101 rep 1 Cross Validated 60 rep 10 MathOverflow 60 rep 10