exam Maths Puzzle Numerical Ability

Graph each function for the primary wave. Label the coordinates of each point graphed. a) y=-2sin(3x-(pie/2))+1
b) y=20+7cos((3pie/4x)+(3pie/4))

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exam Other Question

(x - 2/3)^2 = 14

help to solve would be appreciated

thank you
Let X and Y be nonempty sets and let h:X x Y -> R have a bounded range in R. Let f:X -> R and g:X->R be defined by f(x):=sup{h(x,y) : y in Y}, g(y) := inf{h(x,y) : x in X}. Prov