Question

Ans this ques fasttttt

Answer 1

cos2A=2cosA^2-1 .So we solve the program using this formula=>
$\sqrt{2 + \sqrt{2 + 2 \cos(4x) } } =$
√2+√2(1+cos4x)=√2+(√2(2cos2x^2)=√2+√4cos2x^2 =√2+2cos2x=√4cosx^2=2cosx. (c) is the correct option.

Answer 2

anssss s s. s. d. x..