\(\rm \left[ {\frac{{\left( {{{\sec }^3}x\, - \,{{\tan }^3}x} \right)}}{{\left( {\sec x\, - \,\tan x} \right)}}} \right]\) - 2 tan2x - sec x tan x = ?
1
0
2
2
3
1
4
-1
\(\rm \left[ {\frac{{\left( {{{\sec }^3}x\, - \,{{\tan }^3}x} \right)}}{{\left( {\sec x\, - \,\tan x} \right)}}} \right]\) - 2 tan2x - sec x tan x = ?