What is $\sqrt{-4}\sqrt{-9}$?
3712
Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
69172
$y'=$ ${-x+\sqrt{(x^2+4y)}}\over 2$ , $y(2)=-1$
68746
What is $f(f^{-1}(A))$?
16931
Can one do the maths of physics without using $\sqrt{-1}$?
81750
$4 \sin 72^\circ \sin 36^\circ = \sqrt 5$
7463
Square root of a square
34227
Continued fraction of a square root
110826
prove that : $ i = \sqrt {-1}\ $
73881
A question on numerical range
124248
$1+\frac {1}{4}(1+\frac {1}{4}) +\frac {1}{9}(1+\frac {1}{4} +\frac {1}{9})+....$
71044
Can the square root of a real number be negative?
144765
Solving $\sqrt{x+5} = x - 1$
110955
Find the coefficient of $x^9$ in $(1+x)(1+x^2)(1+x^3)\cdots(1+x^{100})$
708
Find the minimum of $(u-v)^2+ (\sqrt{2-u^2}-\frac{9}{v})^2$ for $00$.
37189
Exponent of a number is a square root?
150841
How to read this mathematics value: 10^9
134075
Inverse of $A^{-1}+B^{-1}$