Can anyone invert
$y = a \cos(x) + b \sin(2x)$
to give $x = f(y)$? An exchange on 29 June 2017 said this was possible but I cannot find the solution. Also, is
$y = a \sin(x) + b \sin(2x)$
invertible in the same way?
Many thanks.
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Consider using Weierstrass substitution formulas – Jean Marie Apr 10 '22 at 21:48
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Where was the "exchange on 29 June 2017"? Can you link to it in the question? – David K Apr 10 '22 at 23:24