I just compiled the MPIR library for visual studio and I found out it does not have trigonometric functions, nor root functions for floating point numbers.
The reason I need this, is because I need to do some calculations with transcendentals which have precision greater than 1000 digits.
If anyone could suggest a library which is capable of this and preferably works well with visual studio 2010, I would be very grateful.
Have a look at the related software links on the GNU MPFR homepage.
In particular, MAPM may do what you want:
It sounds like it should work with Visual Studio: