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To find the Modulus of a complex number

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#complex-numbers #fractions #absolute-value
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What does $|a| = |b|$ is equal to?

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#algebra-precalculus #absolute-value
565
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Symmetric polynomial written in elementary polynomials

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#polynomials #radicals #absolute-value #substitution #symmetric-polynomials
130
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If $|ax^2+bx+c|\le \frac12$ for all $|x|\le1$, then $|ax^2+bx+c|\le x^2-\frac12$ for all $|x|\ge1$

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#algebra-precalculus #inequality #absolute-value
77
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Proving that a double integral converges

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#integration #trigonometry #convergence-divergence #definite-integrals #absolute-value
69
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Equation system

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#systems-of-equations #absolute-value
582
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If $\sqrt{9−8\cos 40^{\circ}} = a +b\sec 40^{\circ}$, then what is $|a+b|$?

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#trigonometry #radicals #absolute-value
115
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Proving that inequalities $\|a\|_{\infty} \leq \|a\|_2 \leq \sqrt{n} \|a\|_{\infty}$ are true and sharp.

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#real-analysis #inequality #radicals #absolute-value
641
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Find a number $M$, such that $|x^3-4x^2+x+1| < M$ for all $1<x<3$

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#real-analysis #polynomials #optimization #absolute-value #maxima-minima
99
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Absolute Value of a Complex Number Inequality

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#complex-analysis #inequality #absolute-value
169
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Maximum of a product of absolute values

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#functions #optimization #absolute-value #maxima-minima #a.m.-g.m.-inequality
182
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Solving absolute value equation in complex numbers

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#complex-analysis #absolute-value
161
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Find the minimum value of $|x+1|+2|x-5|+|2x-7|+|\frac{x-11}{2}|$

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#systems-of-equations #maxima-minima #absolute-value
127
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How to rephrase these delta epsilon inequalities?

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#calculus #inequality #absolute-value #epsilon-delta
109
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How to prove this delta-epsilon proof?

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#calculus #limits #proof-writing #absolute-value #epsilon-delta

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