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12h
comment Evaluate $\int \sin(3x)\cos(4x) \,dx$
See mathworld.wolfram.com/WernerFormulas.html
13h
comment What would be the value of the limit $\lim _{x\to \infty} (\frac{3x +1}{3x-1})^{4x}$?
@KaustabhaRay, Have you noticed Use $$\lim_{n\to\infty}\left(1+\dfrac1n\right)^n=e$$
13h
comment What would be the value of the limit $\lim _{x\to \infty} (\frac{3x +1}{3x-1})^{4x}$?
@KaustabhaRay, So, we are done!
13h
answered Solving $\arcsin(\sqrt{1-x^2}) +\arccos(x) = \text{arccot} \left(\frac{\sqrt{1-x^2}}{x}\right) - \arcsin( x)$
14h
answered What would be the value of the limit $\lim _{x\to \infty} (\frac{3x +1}{3x-1})^{4x}$?
21h
comment Find all positive inegers solution for $x^2-xy-y^2=1$
$$4=(2x-y)^2-5y^2$$
1d
comment The angle giving minimum value
See math.stackexchange.com/questions/301800/…
1d
comment Prove that $\tan20^\circ\tan40^\circ\tan60^\circ\tan80^\circ=3$
Related math.stackexchange.com/questions/455070/…
2d
awarded  Great Answer
2d
comment Prove: $\arcsin\left(\frac 35\right) - \arccos\left(\frac {12}{13}\right) = \arcsin\left(\frac {16}{65}\right)$
Use math.stackexchange.com/questions/672575/…
Apr
26
awarded  Enlightened
Apr
26
awarded  Nice Answer
Apr
25
answered Solve $\cot^2(x) -\cot(x) - 1=0$
Apr
25
answered Prove $\sin(A-B)/\sin(A+B)=(a^2-b^2)/c^2$
Apr
24
comment Let the smallest positive integer with six positive odd integer divisors and twelve positive even integer divisors, be n. What is the unit digit of n?
artofproblemsolving.com/wiki/…
Apr
24
comment Given that $\cos A + \cos B + \cos C = 0$ and $\sin A + \sin B + \sin C = 0$.
@Ananya, Find the necessary & the sufficient condition : math.stackexchange.com/questions/1397066/…
Apr
23
comment Is there a general rule to find period of multiplied functions?
Provided $$\dfrac{p_1}{p_2}$$ is rational. In that the resultant period must divide the LCM
Apr
23
comment Proving the GCD property of the Fibonacci numbers
cut-the-knot.org/arithmetic/algebra/FibonacciGCD.shtml OR en.wikipedia.org/wiki/Fibonacci_number#Divisibility_properties
Apr
23
answered In an triangle the least angle is $45^\circ$ and the tangents of the angles are in $A.P.$If its area be $27$ sq.cm.Find the lengths of its sides.
Apr
23
comment Solve the equation $\sqrt{1-x}=2x^2-1+2x\sqrt{1-x^2}$
@Ovi, So, the root is not $\cos126^\circ$