Question

what is the correct expression to: 2cos2(θ)−1 =?

Answer 1

\[2\cos ^{2}(\theta)-1 ....... or ........ 2\cos(2\theta)-1\]
Which form?

Answer 2

Enter the expression 2cos2(θ)−1, where θ is the lowercase Greek letter theta.

Answer 3

the 1st form you wrote

Answer 4

What exactly is asked? Is the expression equal to something?

Answer 5

cos 2θ = 2cos^2θ - 1

Answer 6

the question marks are theta