If f(x)|cos(2x)cos(2x)"sin"(2x)-cosxcosx...

If `f(x)|cos(2x)cos(2x)"sin"(2x)-cosxcosx-sinxsinxsinxcosx|,t h e n:` `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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If `f(x)|cos(2x)cos(2x)"sin"(2x)-cosxcosx-sinxsinxsinxcosx|,t h e n:` `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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