They aren't. They aren't.
in everyday life we need pencil and ruler
Examples: batteries, magnets.
There are countless step functions which are there in everyday life. This mainly entails billing of utilities like water, gas and electricity which are measured using step functions.
when you cook
When you're on the computer or on the TV is an example of radiation in everyday life.
rusting of iron
I use them everyday with a spread sheet.
importance of circular function
A vending machine.
Can you use trigonomic functions in real life situations? It's not like you carry a calculator with you everywhere... Very unlikely unless you have a job that requires trig skills.
i dont knoe