SOLUTION: show that cos (2arc sin x)=1-2x2

SOLUTION: show that cos (2arc sin x)=1-2x2

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Question 770262: show that cos (2arc sin x)=1-2x2
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
using double angle formulas we write:

with

then we notice:

and therefore

:)
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