Find dy/dx
y = (sec x + tan x)⁻⁴
a. dy/dx = 4(sec x tan x + sec x)⁵
b. dy/dx = 4(sec x + tan x) * (tan x + sec x)⁴
c. dy/dx = A(sec x + tan x)⁻⁵
d. dy/dx = 4sec x * (1 + tan x)