exam Maths Puzzle Numerical Ability

Find the exact value of:
(1/cos^240 degrees)-(1/cot^240 degrees)

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exam Other Question

Write the equation of the line passing through the given pair of points.

(2,-3) and (2,4)
show work and equation please what is the Y intercept of the line that passes through the points (0,4) and (5,-6)