ENEM
ITA
IME
FUVEST
UNICAMP
UNESP
UNIFESP
UFPR
UFRGS
UNB
(UFSCAR - 2003) O valor de x, \(0\leq x\leq\frac{\pi}{2}\) , tal que \(4\cdot\left(1-sen^{2}x \right )\left(sec^{2}x - 1 \right ) = 3\) é
\(\frac{\pi}{2}\)
\(\frac{\pi}{3}\)
\(\frac{\pi}{4}\)
\(\frac{\pi}{6}\)
0