Question

Find the value of the sec 19° using your calculator.
How do you solve this

Answer 1

with calculator machine

Answer 2

sec(19) = 1/cos(19).
make sure your calculator is set to accept "degrees" and not "radians" and then enter 19 and press "cos" then press the key to invert this - usually marked as "1/x".

Answer 3

how do u know sec is cos

Answer 4

sec is not cos. sec is defined as 1 divided by cos - that is the definition of sec.

Answer 5

see here for examples: http://www.mathsrevision.net/alevel/pages.php?page=31

Answer 6

ok thank you i can use that to fined the anser

Answer 7

yw