lab bhattacharjee
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 Apr 19 comment Show that $\sin \theta = \frac{\cos(0.5\theta)-\cos(1.5\theta)}{2\sin (0.5\theta)}$ Apr 19 answered Evaluate: $\csc^2\left(\frac{\pi}{9}\right)+\csc^2\left(\frac{2\pi}{9}\right)+\csc^2\left(\frac{4\pi}{9}\right)$ Apr 19 answered Calculate $\sin\dfrac{3\pi}{14}-\sin\dfrac{\pi}{14}-\sin\dfrac{5\pi}{14}$ Apr 19 comment $\sqrt{a} +\sqrt{b} = 20$. What is the maximum value of $a-5b$? @zz20s, Please Google, u'll find too many links:) Apr 19 answered $\sqrt{a} +\sqrt{b} = 20$. What is the maximum value of $a-5b$? Apr 17 comment Solving Equation for $x$ Apr 17 answered Solving Equation for $x$ Apr 17 comment Geometric Series question @Maths2468, See en.wikipedia.org/wiki/… and en.wikipedia.org/wiki/… Apr 17 answered The number $2$ is a real root of $z^3=8$. Find the distance $|2-w|$ if $w$ is a complex root of $z^3=8$? Apr 17 answered Geometric Series question Apr 17 comment If a chord joining the points $P(a\sec\alpha,a\tan\alpha)$ and $Q(a\sec\beta,a\tan\beta)$ on the hyperbola $x^2-y^2=a^2$ is a normal to it at $P$,then @Brahmagupta, Please find the updated version. Apr 17 revised If a chord joining the points $P(a\sec\alpha,a\tan\alpha)$ and $Q(a\sec\beta,a\tan\beta)$ on the hyperbola $x^2-y^2=a^2$ is a normal to it at $P$,then deleted 56 characters in body Apr 17 comment If primitive root modulo $mn$, then primitive root modulo $m$ and $n$ Apr 17 comment Prove that 4 is not a primitive root modulo n, for $n \ge 2$ @CnR, What is the order of $a\pmod m,$ if $a$ is a primitive root $\pmod m$ Apr 17 comment Prove that 4 is not a primitive root modulo n, for $n \ge 2$ Similarly you can prove $$4^{\phi(m)/2}\equiv1\pmod m$$ Apr 17 comment How to calculate $\lim\limits_{x\to 0} \frac{[\sin{x}-x][\cos({3x})-1]}{x[e^x -1]^4}$ without using L'Hôpital's Rule? Apr 17 answered Show that $\tan \alpha \tan \beta + \tan \beta\tan \gamma +\tan \gamma\tan \alpha =1$ Apr 17 answered Show that $\tan \alpha \tan \beta + \tan \beta\tan \gamma +\tan \gamma\tan \alpha =1$ Apr 16 answered Show that $\gcd(80,8a^2+1)=1$ Apr 16 answered How can I solve this problem $\sqrt{30 \sqrt{30 \sqrt{30 …}}}$