Question

can i say that (1-9x^2)^-1/2 = sqr(1-9x^2)?

Answer 1

\[(1-9x^2)^{-1/2} = \sqrt{(1-9x^2)}\]

Answer 2

or does the 1/2 has to be positive?

Answer 3

@sunnnystrong

Answer 4

Hmmm.. it has to be positive because:
\[(1-9x^2)^{-1/2}=\frac{ 1 }{ \sqrt{1-9x^2} }\]