Simplify-50 1/2 + (-12.3)

Ifigured out the question and i dont know what to put here

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Im gonna fail 7th grade selective breeding 1. creates offspring which are genetically identical to the parent 2. is the process of breeding only organisms with desirable traits 3. involves the removal of the nucleus of a cell 4. combines traits from organisms of different species