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Solutions when cos 2θ = 0 or tan (3θ) - 1 = 0 for 0 ≤ θ ≤ 360. 8 solutions (cos: 45, 135, 225, 315 tan:15, 75, 135, 195, 255, 315)

v=0 when x=3 or 7. v=0 at end point of motion, so centre of motion must be (3 +7)/2

cos θ not cos 2θ

Having only achieved a Band 2 in General Maths you will find a bridging course will move way too fast. Griffith University offers a one semester Tertiary Preparation program which would be more appropriate.