Question

How do you find the exact values of cos (14pi/4)?

Answer 1

0

Explanation:

Firstly `(14pi)/4" simplifies to" (7pi)/2`

and `cos((7pi)/2)=cos((7pi)/2-2pi)=cos((3pi)/2)`

`color(orange)"Reminder " color(red)(bar(ul(|color(white)(a/a)color(black)(cos((3pi)/2)=0)color(white)(a/a)|)))`

`rArrcos((14pi)/4)=cos((3pi)/2)=0`