If f(x)=[[cos(2x),cos(2x),sin(2x)],[-cos...

If `f(x)=[[cos(2x),cos(2x),sin(2x)],[-cosx,cosx,-sinx],[sinx,sinx,cosx]]`, then:` `f^(prime)(x)=0` at exactly three point in `(-pi,pi)` `f^(prime)(x)=0` at more than three point in `(-pi,pi)` `f(x)` attains its maximum at `x=0` `f(x)` attains its minimum at `x=0`

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