Contourplot y tan x - 9.81/2 y^2 1/cos^2 x /110^2 - 105=0, x=-pi/2 to pi/2, y=-1300 to 1300Contourplot y tan x - 9.81/2 y^2 1/cos^2 x /110^2 - 105=0, x=-pi/2 to pi/2, y=-1300 to 1300

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