Question

What is `sec(arcsin (4/5))`?

Answer 1

Find `sec (arcsin (4/5))`

Ans `+- 1.67`

Explanation:

Using calculator -->
`sin x = 4/5 = 0.80` --> arc `x = 53.15` deg and
arc `x = 180 - 53.15 = 126.85` deg
cos 53.15 = 0.60
`sec (53.15) = 1/cos 53.15 = 1/0.60 = 1.67`

cos 126.85 = -0.60
sec (126.85) = 1/cos = 1/-0.6 = -1.67
Ans: `+- 1.67`