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10h
answered find the interval of convergence of the power series
10h
answered how to solve $2^x \bmod 53 ≡ 1$?
10h
answered Finding conditional extrema with trig functions
13h
answered Harmonic progression based question
15h
answered Find min & max of $f(x,y) = x + y + x^2 + y^2$ when $x^2 + y^2 = 1$
1d
answered trigonometric proof relationship
1d
awarded  problem-solving
2d
comment How to prove an identity (Trigonometry Angles--Pi/13)
Related: math.stackexchange.com/questions/55120/… math.stackexchange.com/questions/578286/… math.stackexchange.com/questions/834962/… math.stackexchange.com/questions/11246/…
2d
comment When is the cosine of $\pi/n$ of a certain form?
See en.wikipedia.org/wiki/Constructible_polygon#General_theory
2d
comment Help me finding nth derivate
See learnmathforfree.jimdo.com/calculus/nth-derivative
2d
answered Help me finding nth derivate
2d
comment Show divisibility by 7
@Rescy_, This was inspired by the idea of Modular Arithmetic and please go through the updated link :"generating all primitive triples" WLOG $(a,b)=1$
2d
answered Trigonometry identity $\csc x\cot x=\frac{\cos ^3x}{\sin^2 x}+\cos x$
2d
answered Trigonometry problem
2d
answered Show divisibility by 7
2d
answered Show divisibility by 7
2d
answered Elegant solution for $\int {\frac{\cos(y)}{\sin^2(y)+\sin(y)-6}}dy$
2d
answered Computing a remainder of big numbers using modular arithmetic
2d
answered Finding the equation of a circle given 3 points without using elimination
2d
answered To calculate the remainder of (111…) + (222…) + (333…) + (444…) + (555…) + (666…) +(777…) by 37