root2+root2+2cos4x what is the value of it
Answers
Answered by
2
Answer: √{2+√(2+2cos4x)}
=√[2+√{2+2(2cos²2x-1)}]
=√{2+√(2+4cos²2x-2)}
=√(2+√4cos²2x)
=√(2+2cos2x)
=√{2+2(2cos²x-1)}
=√(2+4cos²x-2)
=√4cos²x
=2cosx(Proved)
Similar questions