Geometry Stuff (PLEASE HELP ANSWER ITS DUE IN AN HOUR)

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

Aportion of a line bounded by two points is defined as

Answer soon(fast) 15 pts-brainliest? for right answer with small explination a restaurant catered a party for 40 people. a child’s dinner (c) cost $11 and an adult’s dinner (a) cost $20. the total cost of the dinner was $728. how many children and adults were at the party? use the table to guess and check.(i couldn't get the graph onto the question)                                8 children and 32 adults9 children and 31 adults10 children and 30 adults12 children and 28 adults