exam Maths Puzzle Numerical Ability

write the equation of each parabola.
focus(10,0); directrix x=-10

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trapezoid ABCD. Smaller base AB=5. Lg base CD. Diagonals AD=BC intersect in ponint F. Area triangle ABF=15. It s given that Area triangleABC is half Area triangle ACD. Find Area Tr I have this problem and I need to solve it using Identies, but it also has restrictions such as theta is more than or equal to zero and theta is less than or equal to 360 the equation is this 4cos(squared, theta)-1=0