SOLUTION: prove that ( double angle formula) a) cos^2 2A = 4cos^4 A -4cos^2 A+1 can u plz me sloving this thx

SOLUTION: prove that ( double angle formula) a) cos^2 2A = 4cos^4 A -4cos^2 A+1 can u plz me sloving this thx

Algebra.Com

Question 1120331: prove that ( double angle formula)
a) cos^2 2A = 4cos^4 A -4cos^2 A+1
can u plz me sloving this
thx
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Factor the right side into (2 cos^2 A-1)^2
Take the square root
cos 2A=2 cos^2A-1
RELATED QUESTIONS
prove the following using double angle formula A) sin^2 2A= 4cos^2 A- 4cos^4 A plz... (answered by solver91311)

using double angle formula prove a) sin^ 2 2x( cot^2 x-tan^2 x)= 4cos 2x very... (answered by solver91311)

Use the square identities to simplify 2(sin^2x)(sin^2x). {{{A.3+4cos(2x)+cos(4x)}}} (answered by rcdodds)

find x where 0<\x<\360 A) sec x + 4cos x =5 Plz help me i try lots but invain. thx (answered by Theo)

using double angle formula find all values of x such 0� < x < 360� for which a) 2cos... (answered by solver91311,greenestamps)

using double angle formula find all values of x such 0 degree is less than x less than... (answered by Boreal)

1.Derive a formula for cos 2A with aid of cos (A + B). 2.Prove that 2 tan x + 2 cot x =... (answered by Edwin McCravy)

prove... (answered by Alan3354)

solve for (0,2pi) 4cos x+ 4cos^2 x+1=0 (answered by Alan3354,ikleyn)