The function `f(x)=sin^4x +cos ^4 x increases` if

The function f(x) = sin^(4)x + cos^(4) x increases if

The function f(x) = sin^(4)x + cos^(4) x increases if a) 0 lt x lt pi//8 b) pi//4 lt x lt 3 pi//8 c) 3 pi//8 lt x lt 5pi//8 d) 5 pi//8 lt x lt 3 pi//4

The function f(x)=sin^(4)x+cos^(4)x increasing if

The function f(x)=sin^4x+cos^4x increasing if :

The function f(x) = sin ^(4)x+ cos ^(4)x increases, if

The function f(x)=sin^4x+cos^4x increasing if 0

The function f(x) = sin ^(4)x+ cos ^(4)x increases, if (A) 0 lt x lt (pi)/(8) (B) (pi)/(4) lt x lt (3pi)/(8) (C) ( 3pi)/(8) lt x lt (5pi)/(8) (D) ( 5pi)/(8) lt x lt(3pi)/(4)

The function f(x) = sin ^(4)x+ cos ^(4)x increases, if (A) 0 lt x lt (pi)/(8) (B) (pi)/(4) lt x lt (3pi)/(8) (C) ( 3pi)/(8) lt x lt (5pi)/(8) (D) ( 5pi)/(8) lt x lt(3pi)/(4)

The function f(x)=sin^4x+cos^4x increasing in interval