Added negative support for acos, asin

[Gameboy612]

acos(-cos(x)) after simplify(..., inverse=True) fails to simplify to pi - x.

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• simplify
  • Corrected asin, acos not working in the case for negative numbers. Formerly, acos(-cos(x)) does not simplify to pi - x, asin(-sin(x)) does not simplify to -x. (This fix only applies to the inverse=True flag)

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• simplify
  • Corrected asin, acos not working in the case for negative numbers. Formerly, acos(-cos(x)) does not simplify to pi - x, asin(-sin(x)) does not simplify to -x. (This fix only applies to the inverse=True flag) (#26542 by @Gameboy612)

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acos(-cos(x)) after simplify(..., inverse=True) fails to simplify to pi - x.

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<!-- BEGIN RELEASE NOTES -->
* simplify
  * Corrected asin, acos not working in the case for negative numbers. Formerly, `acos(-cos(x))` does not simplify to `pi - x`, `asin(-sin(x))` does not simplify to -x. (This fix only applies to the inverse=True flag)
<!-- END RELEASE NOTES -->

[oscarbenjamin]

This does not check whether the argument is a sin function.

Also print should not be used.

[Gameboy612]

Thanks, I'll fix it when I'm back