Find the exact value by using a half-angle identity. cos five pi divided by twelve

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

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years