The phrase "demonstrate knowledge in" is correct and can be used in written English.
It is used to indicate that someone is able to show their understanding or expertise in a particular subject or field. Example: "In order to be successful in this position, candidates must demonstrate knowledge in marketing strategies and techniques."
By drawing on conversation analysis and the analysis of embodiment-in-interaction, this article describes students' locally situated, interactional practices of demonstrating knowledge in teacher-led instructional interaction in the English lessons of a Content-and-Language-Integrated-Learning (CLIL) class.
Student projects are also included to demonstrate knowledge learned in the course.
Although accurate knowledge about HIV and AIDS is still too scarce across the developing world, 32 per cent of young men in sub-Saharan Africa can demonstrate knowledge about prevention – in sharp contrast to 24 per cent of their female counterparts.
You have to demonstrate knowledge to get the work in the first place and be reasonably persuasive.
You should also demonstrate knowledge of the recent changes in the way medicine is taught.
Due to their longitudinal nature, PTs are intended to demonstrate knowledge growth as students advance in their undergraduate study.
Students should, for example, demonstrate knowledge of the scientific basis in a special field of interest and insight into current research and development work connected to professional practice.
However, we identified other concepts for which students had more difficulty demonstrating knowledge gain despite in-class instruction and educational activities.
In the European higher education landscape, Dublin descriptors indicate that qualifications are awarded to students who have demonstrated knowledge and understanding in a field and can apply it in a "professional" way.
