- #1

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## Homework Statement

:[/B]Find the general solution of the Trigonometric equation $$\sin {3x}+\sin {x}=\cos {6x}+\cos {4x} $$

Answers given are: ##(2n+1)\frac {\pi}{2}##, ##(4n+1)\frac {\pi}{14}## and ##(4n-1)\frac {\pi}{6}##.

## Homework Equations

:[/B]Equations that may be used:

## The Attempt at a Solution

:[/B]Please see the attached pic:

The answer from Case 1 is correct, but I can't find my mistake in the answers from the two sub-cases of case 2.