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Find the point of local maxima or local ...

Find the point of local maxima or local minima of the function
`f(x) = (sin^(4) x + cos^(4) x) " in " 0 lt x lt (pi)/(2)`

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RD SHARMA ENGLISH-MAXIMA AND MINIMA-All Questions
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  12. Find the maximum and the minimum values of f(x)=3x^2+6x+8,\ \ x in ...

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  14. Find the maximum and the minimum values of f(x)=sin3x+4,\ \ x in (-...

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  15. Find the maximum and the minimum values of f(x)=x^3+1 for all x in ...

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