The derivative of sec x is equal to sec x tan x. The derivative of the first derivative can be determined using the rule of products. The derivative is equal to sec x sec^2 x + tan x * sec x tan x. The simplified answer is sec^3 x + sec^2 x tan x equal to sec^2 x ( sec x + tanx )
111 would be the y-intercept. This is because 111 is on the y-axis.
You might need a maths degree for this one, I believe it’s 4 but don’t quote me on that.
Cos 12 = sin (90 - 12) = sin 78
