What movie and television projects has Dagmar Frederic been in?

It seems you are referring to Dagmar Lassander, a German actress. There is no known actress named "Dagmar Frederic."

Dagmar Lassander has a long career in film and television. Here are some of her most notable projects:

Movies:

* The Tenant (1976)

* The Enigma of Kaspar Hauser (1974)

* The Little Girl Who Lived Down the Lane (1976)

* The Cat (1971)

* Lili Marleen (1981)

* The Secret of the Black Widow (1971)

Television:

* Derrick (1974 - 2000)

* Tatort (1971 - present)

* The Adventures of Sherlock Holmes (1979 - 1985)

* SOKO 5113 (1978 - present)

This is not an exhaustive list, but it gives you a good starting point for exploring Dagmar Lassander's career.