ENEM
ITA
IME
FUVEST
UNICAMP
UNESP
UNIFESP
UFPR
UFRGS
UNB
(ITA 1998) O valor de \(tg^{10}x-5tg^{8}x\cdot sec^{2}x+10tg^{6}xsec^{4}x-10tg^{4}xsec^{6}x+5tg^{2}xsec^{8}x-sec^{10}x\), para todo x \(\in\) [0, \(\frac{\pi}{2}\)[, é:
1
\(\frac{-sec^{2}x}{1+sen^{2}x}\)
\(-secx+tgx\)
-1
zero