Step-by-step explanation:
got to multiply 2 by (1/8)
(2/1)×(1/8)=2/8
simplify it. for top and bottom there are multiples of 2 in common so divide 2 on top and bottom
(2÷2)/(8÷2)=1/4
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
