Show that `f(x)=cos(2x+pi//4)` is an increasing function on `(3pi//8,\ 7pi//8)` .

Show that f(x)=cos(2x+pi/4) is an increasing function on (3 pi/8,7 pi/8)

Show that f(x)=cos(2x+(pi)/(4)) is an increasing function on (3 pi/8,7 pi/8)

Show that f(x)=sin x-cos x is an increasing function on (-pi/4,pi/4)

Show that f(x)=sinx is an increasing function on (-pi//2,\ pi//2) .

Show that f(x)=tanx is an increasing function on (-pi//2,\ pi//2) .

Show that the function f(x)=sin(2x+pi//4) is decreasing on (3pi//8,\ 5pi//8) .

Show that f(x)=cos x is a decreasing function on (0,pi), increasing in (pi,0) and neither increasing nor decreasing in (pi,pi) .

Show that the function f(x)=sin(2x+pi/4) is decreasing on (3 pi/8,5 pi/8)

Show that function f(x)=sin(2x+pi/4) is decreasing on ((3pi)/8,(5pi)/8)dot

Show that function f(x)=sin(2x+(pi)/(4)) is decreasing on ((3 pi)/(8),(5 pi)/(8))