Strange result for Integrate(a*Sin(a^4),a)

[Dev AM]

Why I get this strange result?

1/2FresnelS(2^(1/2)a^2Pi^(-1)^(1/2))(1/2)^(1/2)*Pi^(1/2)

[Axel Kramer]

The Rubi engine determines this result: http://www.apmaths.uwo.ca/~arich/

Unfortunately the FresnelS() function is not yet implemented in Symja.

[Axel Kramer]

Implemented FresnelC() and FresnelS() function for a numeric double argument.

See commit: https://bitbucket.org/axelclk/symja_android_library/commits/ec5b55f46d01b098b3f1f2ef094b703fb68a7314