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Mathematics: Post your doubts here!

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what year is it?

the equation at ii uses 2 theta, so its actually Rsin(2t-alpha), not just 1 theta
this is winter 2008 and I got it, I was just 1 theta lol.

can someone please explain me through this:


I've no clue where to begin.
 
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can someone plz solve Q6 part two.
And explain how to proceed once you get cos^-1 = 50.7
I'm stuck there!
 

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