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Aug
23
answered parametric equations $(y-1)^2=x-49$.
Aug
23
comment If $f’(x) = \sin x + (\sin4x)(\cos x)$, then $f’(2x^2 + \pi/2) $is?
I think $$f'(x) = \sin x + \sin4x \cdot \cos x$$ should be $$f(x) = \sin x + \sin4x \cdot \cos x,$$
Aug
23
revised If $f’(x) = \sin x + (\sin4x)(\cos x)$, then $f’(2x^2 + \pi/2) $is?
deleted 1 character in body
Aug
23
answered If $f’(x) = \sin x + (\sin4x)(\cos x)$, then $f’(2x^2 + \pi/2) $is?
Aug
23
revised Solve this inequality equation with 3 sides?
added 131 characters in body
Aug
23
comment Solve this inequality equation with 3 sides?
@jb3navides, Can't you follow the same method?
Aug
23
answered Solve this inequality equation with 3 sides?
Aug
23
answered Finding coordinates of points $P, Q$ given $A, P, Q$ are collinear.
Aug
22
comment What is the least prime $p$, such that $[p-1000,p+1000]$ does not contain a prime $\ne p$?
mathworld.wolfram.com/FactorialPrime.html says $p\ge11$
Aug
22
answered Prove $a|b \wedge b|a \implies a=\pm b$
Aug
22
comment What's the condition for (x+kp) and pq being coprime?
We need $(x,p)=1, (x+kp,q)=1$
Aug
22
comment If $f(x) = \cos x\cos2x\cos4x\cos8x\cos16x$, then $f’(\pi/4)= ?$
@Bernard, Agreed. But the basic idea was to use double angle formula repeatedly.
Aug
22
comment Integrating $\frac{1}{(x^4 -1)^2}$
@shauryagupta, Sorry, not sure about such term.
Aug
22
revised Integrating $\frac{1}{(x^4 -1)^2}$
deleted 8 characters in body
Aug
22
answered Induction Proof 3
Aug
22
comment Find the minimum value of $(x+y)$
@SheowBoon, Use en.wikipedia.org/wiki/Second_derivative_test on $$f(x)=x+8+\dfrac1{16x^2}$$
Aug
22
revised Integrating $\frac{1}{(x^4 -1)^2}$
deleted 97 characters in body
Aug
22
answered Integrating $\frac{1}{(x^4 -1)^2}$
Aug
22
answered If $f(x) = \cos x\cos2x\cos4x\cos8x\cos16x$, then $f’(\pi/4)= ?$
Aug
22
answered Find the minimum value of $(x+y)$