Posted by sam on Sunday, October 2, 2011 at 5:12pm.
Find all solutions to the equation
2cos(2x) = x + 1, correct to 4 decimal places.

trig  Steve, Monday, October 3, 2011 at 5:32am
2 cos(2x) never gets out of the range [2,2]
So, whenever x+1 > 2, there are no solutions.
That means all solutions are in [3,1]
A little NewtonRaphson should work nicely here, or a bisection method.
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