If x+y=45°, prove that:
(cotx + 1) (coty + 1)/cotx. coty=2

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

According to your text, the best way to reduce the number of germs is by ventilating spaces and a. cleaning all toys, books, and materials every day. b. keeping all potentially sick individuals out of the center. c. minimizing strenuous physical activity among the children. d. cleaning, sanitizing, and disinfecting surfaces and materials.

Bennett has trouble interacting with other students in school lately. he has become frustrated easily when asked to work in groups, and he has been withdrawing from class discussions. his teacher is worried about his