Question

f(x)=2sec^2(x^7). Find f'(x).

Answer 1

\[=2\frac{ d }{ dx }(secx^7)^2\]
\[=2*2(secx^7)*(secx^7)'\]

Answer 2

\[=4secx^7*\sec(x^7)\tan(x^7)*(x^7)'\]

Answer 3

\[=4secx^7secx^7tanx^7*7x^6\]

Answer 4

what did i do wronggg?