If the function FX = ax * 2 + BX is odd when x belongs to [b-1,2b], then the range of FX is

b-1=-2b
b=1/3
X belongs to [- 2 / 3,2 / 3]
f(x)=ax*2+bx
f(-x)=ax*2-bx
f(x)=f(-x)
a=0
f(x)=x/3
The range of F (x) is
[-2/9,2/9]

Find all pairs of real numbers (x, y) satisfying the equation (TaNx) ^ 4 + (tany) ^ 4 + 2 (Cotx) ^ 2 (Coty) ^ 2 = 3 + sin ^ 2 (x + y)

(tanx)^4+(tany)^4>=2(tanx)^2(tany)^2
2(tanx)^2(tany)^2+2/[(tanx)^2(tany)^2]>=4
3+[sin(x+y)]^2

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