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 December 6th, 2016, 11:49 PM #1 Member     Joined: Nov 2014 From: SG Posts: 55 Thanks: 1 How to find A for this Question? Given the following 50 = 144 cos^2(pi*A/41.35) How do I find A?
 December 7th, 2016, 12:33 AM #2 Global Moderator   Joined: Dec 2006 Posts: 17,477 Thanks: 1313 What have you attempted?
 December 7th, 2016, 12:49 AM #3 Member     Joined: Nov 2014 From: SG Posts: 55 Thanks: 1 Not sure if this is correct This is my attempt so far. sqrt(50/144) = cos (pi*A/41.35) cos^-1 (sqrt(50/144) ) = pi*A/41.35 [ cos^-1 (sqrt(50/144) ) ] * 41.35 /pi = A
 December 7th, 2016, 02:35 AM #4 Global Moderator   Joined: Dec 2006 Posts: 17,477 Thanks: 1313 That gives A = 12.38106... (which is the smallest positive value for A). More generally, A = ±12.38106... + 2k$\pi$, where k is an integer.

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