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Jun
28
answered Trigonometrical inequation problem
Jun
28
answered Trigonometrical inequation problem
Jun
28
comment Prove that $\tan^6 20°+\tan^6 40°+\tan^6 80°$ is an integer
Related : math.stackexchange.com/questions/175736/…
Jun
28
comment Problems on Pythagorean triangle
@N.S., Please disclose what is "the first part" here?
Jun
28
comment Problems on Pythagorean triangle
@math131,I think the question meant: mathworld.wolfram.com/PrimitivePythagoreanTriple.html. Then the number in each case is exactly one. Else, $4d-d,4d,d+4d$ always are Pythagorean triplets whose sides are in Arithmetic Progression
Jun
28
comment Problems on Pythagorean triangle
@math131, Wiki: "A right triangle whose sides form a Pythagorean triple is called a Pythagorean triangle."
Jun
28
answered Problems on Pythagorean triangle
Jun
28
comment $A\sin X +B\cos X=c,\,B\sin X -A\cos X =d.$ Eliminate $X$
@virat, This is formally know as proofwiki.org/wiki/Brahmagupta-Fibonacci_Identity
Jun
28
awarded  complex-numbers
Jun
27
answered Determining the relative size of $a^n$ and $b^m$ without using logarithms
Jun
27
comment Infimum taken over $\lambda$ in $\mathbb{C}$
@Suhail, Welcome. Rectified. thanks
Jun
27
revised Infimum taken over $\lambda$ in $\mathbb{C}$
added 12 characters in body
Jun
27
answered Infimum taken over $\lambda$ in $\mathbb{C}$
Jun
27
comment What is the solution of $2^{2^{2^2}}$?
@user34353, Parentheses has been used to prioritize the operations. $$a^{(b^c)}$$ means $b^c$ has to be performed earlier
Jun
27
answered Series involving complex roots
Jun
26
comment The roots of $x^4+4x^3+5x^2+2x+2=0$ one root being $-1+i$ are
See en.wikipedia.org/wiki/Complex_conjugate_root_theorem
Jun
26
answered Find the formula for the inverse of $y=\frac{1-\sqrt x}{1+\sqrt x}$
Jun
26
revised solving the equation by reducing it to quadratic form
added 36 characters in body
Jun
26
comment solving the equation by reducing it to quadratic form
@tapadianewlon, Please find the updated version
Jun
26
revised solving the equation by reducing it to quadratic form
added 42 characters in body