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Verifying a half angle formula

Attachment 24198

I have tried this one several times and I feel like I am going in circles. Probably has an easy solution and I will be embarrassed. Any help or guidance will be appreciated. Thank You

I used this to write the equation: Online LaTeX Equation Editor - create, integrate and download

Re: Verifying a half angle formula

On the RHS, write as and as multiply top and bottom by and then, (assuming that you are allowed to), make use of the identities

and

Re: Verifying a half angle formula

Hello, dudewithmathproblems!

We can work from the LHS . . .

. . . . .

Divide numerator and denominator by

. . . . .