Question

Simplify 2cos^2(x/2)-1

Answer 1

cos(2x)=2cos^2(x)-1
this is actual formula

Answer 2

so replace x by x/2

Answer 3

\[\cos(2*\frac{ x }{ 2 })=2os^2(\frac{ x }{ 2 })-1\]

Answer 4

= cosx

Answer 5

Hey I know it's been over a week but thanks for the help