Answer:
okkkkkkkkkkkkkkkkkkkkkkkkkkkk
A. 2(length + width) >= 134
length + width >= 134/2
length >= 67 - 29
length >= 38 ft
tan x = sin x/cos x
cos³ x *tan²x - cos x = cos³x *(sin²x/ cos² x) - cos= cosx*sin²x - cos x =
= cos x(sin² x - 1) = - cos x(1 - sin²x)= - cosx*cos²x = - cos³ x
I believe your answer is a-^4•8^14
