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Feb
5
answered Finding $\lim_{x\to -2}{\frac{x+2}{\sqrt{-x-1}-1}}\;$ without L'Hospital
Feb
5
comment Proving:$\tan(20^{\circ})\cdot \tan(30^{\circ}) \cdot \tan(40^{\circ})=\tan(10^{\circ})$
Related :math.stackexchange.com/questions/805821/…
Feb
5
comment $z^n=(i+z)^n$, solve for $z$
@gozzo98, Related : math.stackexchange.com/questions/1630356/solve-z6-z-16
Feb
4
comment Base 7 Conversion with Exponents
$$\left(7_{10}\right)^2=49_{10}=100_7$$
Feb
4
revised What is the integral value of $\frac{\tan 20^\circ+\tan40^\circ+\tan80^\circ-\tan60^\circ}{\sin40^\circ}$?
added 11 characters in body
Feb
4
comment Find the condition such that one of the lines defined by $ax^2+2hxy+by^2=0$ has slope $k$ times that of the other
@Iaamuseruser, Comparing the coefficients of $x^2, xy, y^2$
Feb
4
answered What is the integral value of $\frac{\tan 20^\circ+\tan40^\circ+\tan80^\circ-\tan60^\circ}{\sin40^\circ}$?
Feb
4
comment What is the sum of the series: $1+2(1/3)+3(1/3)^2+4(1/3)^3+\cdots$
See math.stackexchange.com/questions/1112394/… OR math.stackexchange.com/questions/587767/…
Feb
4
comment What is the integral value of $\frac{\tan 20^\circ+\tan40^\circ+\tan80^\circ-\tan60^\circ}{\sin40^\circ}$?
@aakankshareddy, What is the source of the great problem? Hope there is an easier proof!
Feb
4
answered What is the integral value of $\frac{\tan 20^\circ+\tan40^\circ+\tan80^\circ-\tan60^\circ}{\sin40^\circ}$?
Feb
4
comment Domain and range of $f(x)=\arcsin[e^{-x}]+ \arcsin [e^x]$
@gammatester, Sorry could not discern the floor function. Thanks
Feb
4
revised Domain and range of $f(x)=\arcsin[e^{-x}]+ \arcsin [e^x]$
added 23 characters in body
Feb
4
comment Domain and range of $f(x)=\arcsin[e^{-x}]+ \arcsin [e^x]$
@saisaandeep, If $\arcsin x=y, x=\sin y$ and for real $y,-1\le\sin y\le1$
Feb
4
answered Domain and range of $f(x)=\arcsin[e^{-x}]+ \arcsin [e^x]$
Feb
4
answered Solve $\int \frac{(\sin x)^2}{a+b\cos x}dx$
Feb
4
answered Find the condition such that one of the lines defined by $ax^2+2hxy+by^2=0$ has slope $k$ times that of the other
Feb
4
comment Trigonometric Equation Simplification
Related : math.stackexchange.com/questions/757497/…
Feb
4
comment Compute $(\sin4^\circ)^2 +(\sin8^\circ)^2+(\sin12^\circ)^2+\cdots+(\sin176^\circ)^2$
HINT: Use $$\cos2A=1-2\sin^2A$$ and math.stackexchange.com/questions/117114/…
Feb
4
comment $z^n=(i+z)^n$, solve for $z$
@Dr.MV, Agreed & rectified. Thanks
Feb
4
revised $z^n=(i+z)^n$, solve for $z$
added 165 characters in body