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 Jan 22 comment How, if at all, does pure mathematics benefit from $2^{74207281}-1$ being prime? +1 for a good answer, and a blast from the (MMF) past! Jan 20 comment How to write a definition of less than $<$? There's nothing terribly wrong with the word - it just seemed funny that a word with such finality would be used to demonstrate $3 < 5$, a fact almost irrelevant to the task at hand. Jan 19 comment How to write a definition of less than $<$? "finally" - ??? Jan 19 comment How to write a definition of less than $<$? No. You are using the < in its own definition! Jan 19 comment Why can't you have more turning points than the degree? "There are four [real] roots, so the degree is at least $4$..." Jan 19 comment GRE Algebra answer is wrong @user247327: The original post said no such thing: math.stackexchange.com/revisions/1617611/1 Jan 19 comment GRE Algebra answer is wrong Surely the percent sign is a typo! Jan 19 revised GRE Algebra answer is wrong added 170 characters in body Jan 19 answered GRE Algebra answer is wrong Jan 19 answered Given two vertices of a rhombus A(-3, -1) and B (9, 5) on opposite ends of a diagonal, what are the other two coordinates? Jan 14 comment Probability to win a chance game en.wikipedia.org/wiki/Hypergeometric_distribution Jan 13 comment Showing that $\mathbb{Z}\cap(-10, 10)$ is open in $\mathbb{R}$ I can't say exactly, but it's very small! Jan 8 comment Value of $a^2 + b^2$ given $a^3 - 3ab^2 = 44$ and $b^3 - 3a^2 b = 8$ @S.Mo - hah! My mistake. Well if you do find the OP, please direct them to my comment :) Jan 8 comment Value of $a^2 + b^2$ given $a^3 - 3ab^2 = 44$ and $b^3 - 3a^2 b = 8$ @S.Mo - maybe some further insight on the context of this question (i.e. where did you find it??) would help us help you Jan 5 comment Differentiating $0.5\sin⁡(2t-\pi/2)$ Part of your misunderstanding might be related to your calling 48x^2 a FUNCTION - it is an expression. $$f(x) = 48x^2$$ is a function! The function you're given is a few steps away. First, it's a more complicated function. Second, the variable is different, which might trip you up. Jan 5 comment How to differentiate both sides with an independent variable if one doesn't have a formula? What is the actual equation that you have? Jan 5 comment Verify the following identities The principal is the same - we introduce exercises before fully developing the theory. Jan 5 comment Verify the following identities @djechlin - you've never seen the statement "the proof of this theorem is beyond the scope of this class"? Or maybe you've never taken a class where the rote exercise of "trig proofs" was taught... Jan 5 comment BODMAS riddle - which is correct? "Is there a reason for this?" - yes, it is a standard. In theory, everyone adhering to the standard will arrive at the same result given the same starting point. Jan 5 comment BODMAS riddle - which is correct? "I fully understand the order of BODMAS" ...