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The maximum of the sine and cosine functions is +1, and the minimum is -1.
Range = Maximum - Minimum = 6 - 1 = 5
(1/x) + (1/y) + (1/z) is a minimum value when x=y=z=10. Symmetry gives either maximum or minimum value.
The minimum number is zero(0). The maximum number is one (1).
y = 2x^2 + x -1 If you know calculus you can find the minimum or maximum when the slope of the equation is zero. This is the first derivative of y with respect to x dy/dx = 4x +1 = 0 4x = -1 x = -1/4 y = 2 (-1/4)^2 -1/4 -1 = 1/8-1/4-1 = 1/8 - 2/8 - 8/8 = -9/8 minimum = -1.125