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How do yous how that the other stationary value of x satisfies the equation tan x=2/x?

given y= #2x^2cosx# and 0 is less than or equal to x which is less than or equal to #pi/2#. 0 is a stationary value of x. Show that the other stationary value of x satisfies the equation tanx = #2/x#

given y= #2x^2cosx# and 0 is less than or equal to x which is less than or equal to #pi/2#. 0 is a stationary value of x. Show that the other stationary value of x satisfies the equation tanx = #2/x#

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