answer:a = 600√3 cm²
diagonals divide a regular hexagon into six equilateral triangles (look at the picture).
the formula of an area of an equilateral triangle with side a:
substitute a = 20 cm:
the area of a regular hexagon is equal six times the area of a triangle:
you went wrong on the 4th line while expanding the parentheses.
(x^2 + 2x)(x^2 + 2x) - 4
= x^4 + 2x^3 + 2x^3 + 4x^2 - 4
= x^4 + 4x^3 + 4x^2 - 4. (answer).
domain: -∞< x< ∞, x≠π/2+nπ, where n is an integer
range: is -∞< y< ∞
the domain of the tangent function is:
-∞< x< ∞, x≠π/2+nπ, where n is an integer
the range is: -∞< y< ∞