can somene help me pleease
Given that:
cos(x+30) = 3 cos(x-30) , prove that,
tan x = - ''root 3''/2
then prove that: (1 - cos '2theta') / sin '2theta' = tan 'theta'
and verify that 'theta' = 180 is a solution of the equation sin 2'theta' = 2 - 2 cos2'theta'