Select two ratios that are equivalent to 2:9

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

Is the following relation a function? x y 1 4 −1 −2 3 10 5 16 yes no

Shiny white dental insurance costs $258 per year. approximately one-third of insured people need a filling, which averages $110 each. 80% of insured people get a preventive check-up each year, and the average cost of this visit is $95. if you consider shiny white’s income and expenses, what is the expected value of each insured customer?