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Sep
25
comment $\text{If } |z_1| = |z_2|, \text{ show that } \frac{z_1 + z_2}{z_1-z_2} \text{is imaginary.} $
@SamirChahine, It's another way of rationalizing the denominator. Please follow the last line of the answer
Sep
25
answered To prove triangle is equilateral> given one equation and one combined equation.
Sep
25
comment $\text{If } |z_1| = |z_2|, \text{ show that } \frac{z_1 + z_2}{z_1-z_2} \text{is imaginary.} $
@SamirChahine, Have you followed the last line? Where have you found it mandatory to multiply fractions?
Sep
25
answered $\text{If } |z_1| = |z_2|, \text{ show that } \frac{z_1 + z_2}{z_1-z_2} \text{is imaginary.} $
Sep
25
answered Solve using Linear Congruences and Divisibility.
Sep
25
revised Multiple answer for integration of a function?
added 102 characters in body
Sep
25
answered Multiple answer for integration of a function?
Sep
25
answered Trigonometric identity
Sep
25
revised Trigonometric AP relation on sides of a triangle
added 3 characters in body
Sep
25
comment Fast modular exponentiation
@JyrkiLahtonen, Tried to address that
Sep
25
revised Fast modular exponentiation
added 152 characters in body
Sep
25
comment Fast modular exponentiation
@user_777, $p-1$ divides lcm$(p-1,q-1),$ right? If $p|c,q|c,$lcm$(p,q)|c$ and here lcm$(p,q)=pq$
Sep
25
comment Fast modular exponentiation
@user_777, Please pinpoint your confusion ?
Sep
25
comment Finding minimum value of a trigonometric expression
mathworld.wolfram.com/JensensInequality.html. It can be made arbitrarily large by making $A\to\pi$
Sep
25
comment Fast modular exponentiation
@user_777, Please find the edited version
Sep
25
revised Fast modular exponentiation
added 63 characters in body
Sep
25
answered Fast modular exponentiation
Sep
25
comment Solving this summation: $\sum_{i=1}^k i\cdot2^i$
@bof, Observe the one by Eric Naslund
Sep
25
comment Solving this summation: $\sum_{i=1}^k i\cdot2^i$
See math.stackexchange.com/questions/30732/…
Sep
25
answered Probably of 2 six in 5 dice rolls