SOLUTION: Can somebody please help provide me with another example or a sketch that demonstrates how you can use a double-angle formula to come up with the formula for an isosceles △?

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Question 1067338: Can somebody please help provide me with another example or a sketch that demonstrates how you can use a double-angle formula to come up with the formula for an isosceles △?
Problem /w uncomplete solution?
https://s23.postimg.org/rp0vqir6z/double_angle.png
Thanks.

Answer by Apples_21(13) About Me  (Show Source):