cos(x/2)/2 is my derivative. and when I set it equal to 0, i try to solve for x.(adsbygoogle = window.adsbygoogle || []).push({});

so cos(x/2)/2=0

cos(x/2)=0/2 this is the part where i'm stuck...a friend of mine did the rest and he came up with whats on the bottom, but I don't know how he did it or if its right...help?

cos x=sqrt2/2

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# Cos(x/2)/2 is my derivative

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