lab bhattacharjee
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 4h comment $\cot^{-1}(x)=\pi+\tan^{-1}(1/x)$ when $x<0$ 4h answered Simple trigonometrical equations 15h comment Is $a \sin x + b \sin y \leq \sin(ax + by)$ true? 15h comment Simplify $\csc(65^{\circ} + \theta) - \sec(25^{\circ} - \theta) - \tan(55^{\circ} - \theta) + \cot(35^{\circ} + \theta)$. @Abhishekstudent, See proofwiki.org/wiki/… 15h answered How to show this integral (Error function) 15h comment Simplify $\csc(65^{\circ} + \theta) - \sec(25^{\circ} - \theta) - \tan(55^{\circ} - \theta) + \cot(35^{\circ} + \theta)$. @Abhishekstudentm $$65^\circ+\theta+(25^\circ-\theta)=90^\circ\iff65^\circ+\theta=90^\circ-(25 ^\circ-\theta)$$ 15h answered Simplify $\csc(65^{\circ} + \theta) - \sec(25^{\circ} - \theta) - \tan(55^{\circ} - \theta) + \cot(35^{\circ} + \theta)$. 17h answered Functions - Trig - Determine 18h comment limit evaluation calculus I 19h comment Proving a complicated identity @Unknown,In case you don't know Double Angle Formula, see the alternative method 1d comment Proving a complicated identity @ClaudeLeibovici, Thanks. I'm an Introvert:) 1d revised Proving a complicated identity added 152 characters in body 1d answered Proving a complicated identity 1d answered Which points lie on the prependicular bisector of (-1,-6) and (5,-8) 1d answered Q: Why is this the limit? 1d answered Combined arithmetic and geometric progression problem 1d comment How to find the maximum and minimum of the function $f(x) = \frac{3x}{x^2 -2x + 4}$ 1d answered How to find the maximum and minimum of the function $f(x) = \frac{3x}{x^2 -2x + 4}$ 1d comment Solve $x + y + z = xyz$ such that $x , y , z \neq0$ math.stackexchange.com/questions/613105/… 1d comment A theoretic question about cosine general solution. @Meitar, For $\cos x/2=-1/\sqrt2,=-\cos\pi/4=\cos(\pi-\pi/4)\implies x/2=2m\pi\pm(\pi-\pi/4)$