# trig

posted by
**alaina**
.

verify the identity.

cos2 x - sin2 x = 1 - 2sin2 x

the 2's next to the sin and cos on the right sides are powers.

posted by
**alaina**
.

verify the identity.

cos2 x - sin2 x = 1 - 2sin2 x

the 2's next to the sin and cos on the right sides are powers.