Saturday, July 13, 2013

find solution cos(2 arcsin x)=-1

%0D%0Acos%282+arcsin%28+x%29%29=-1%0D%0A 

rewriting in terms if sine... 

%0D%0A1-2sin%5E2%28arcsin%28x%29%29=-1%0D%0A 

simplifying... 

x%5E2=1 


x=1 or x=-1 


:)
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