My Math Forum How to find A for this Question?

 Trigonometry Trigonometry Math Forum

 December 6th, 2016, 10:49 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 6th, 2016, 11:33 PM #2 Global Moderator   Joined: Dec 2006 Posts: 19,066 Thanks: 1622 What have you attempted?
 December 6th, 2016, 11:49 PM #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, 01:35 AM #4 Global Moderator   Joined: Dec 2006 Posts: 19,066 Thanks: 1622 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.

 Tags find, question

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post Cliffords777 Calculus 4 July 6th, 2016 06:27 AM frenchie1234 Probability and Statistics 1 December 4th, 2013 01:31 AM nickem Probability and Statistics 15 September 22nd, 2011 05:14 AM nvidia Algebra 5 October 13th, 2009 05:50 AM ElMarsh Algebra 5 September 26th, 2009 07:27 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top