HALPPP PLS I NEEDA TURN THIS IN RN AND IM BERY LATE AND COUNFUSED WHOEVER ANSWERS THIS PLS LET ME KNOW HOW U GOT THIS ANSWER

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

Which equation represents the partial sum of the geometric series?

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?