Find the local maximum or local minimum, if any, of the function `f(x)=s in^4x+cos^4x ,\ \ 0

Find the local maximum or local minimum, if any, of the function f(x)= sin^(4)x+cos^(4)x , where x belongs to [0," "pi /2]

Find the local maximum or local minimum,if any,of the function ^(@)f(x)=s in ^(^^)4x+cos^(^^)4x,11

Find the points of local maximum and local minimum, if any, of the function: f(x)=sin x- cos x, 0 < x < 2pi . Also find the local maximum and local minimum values.

Find the local maxima or local minima,if any, of the function 'f(x)=sin x+cos x,|backslash0

Find the local maximum and local minimum values of the function f(x) = cos^4 x + sin^4 x, (0,pi/2)

Find the local maximum and local minimum values of the function f(x) = (4)/(x + 2) + x .

Find the local maximum and local minimum value of the function f(x) = (2 cos x + x),"where 0" lt x lt pi