Help with Projectile Motion please (1 Viewer)

trea99

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This question is from the Cambridge year 12 extension 1 book
Exercise 3G - Projectile Motion - The time equations question 17 part b)ii)
Cambridge Projectile Motion.jpg
I've done the other parts of the question just not sure how to go about b)ii). I tried double angle results, not sure if I've made a mistake somewhere along the way in my working or am just off.
Thanks!
 

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