# pre-calc

posted by
**Amanda**
.

simplfy the expression by double angle formula or a half angle formula.

cos^2(x/2)-sin^2(x/2)

2sin(x/2)cos(x/2)

posted by
**Amanda**
.

simplfy the expression by double angle formula or a half angle formula.

cos^2(x/2)-sin^2(x/2)

2sin(x/2)cos(x/2)