Question

How do you find the exact value for `sec 315`?

Answer 1

Find sec 315

Ans: `sqrt2`

Explanation:

`sec (315) = 1/(cos 315).` Find cos (315)
`cos (315) = cos (-45 + 360) = cos (-45) = cos (45) = sqrt2/2`

Therefor, `sec 315 = 1/(cos 45) = 2/sqrt2 = sqrt2`