Verify cos^2x = (1+cos(2x))/2

Inactive Tutor answered • 03/03/19

Tutor

New to Wyzant

See tutors like this

cos²(x) = (1 + cos(2x))/2

cos²(x) = (1 + (2cos²(x) -1))/2 [replacing cos(2x) with the double angle identity cos(2x) = 2cos²(x) – 1]

cos²(x) = (2cos²(x))/2 [combining the +1 and -1]

cos²(x) = cos²(x) [canceling the 2's]

Still looking for help? Get the right answer, fast.

Get a free answer to a quick problem.
Most questions answered within 4 hours.

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.

1 Expert Answer