Question

How do you evaluate `sec (40) * sin (50)`?

Answer 1

1

Explanation:

`P = sec (40)sin (50) = sin (50)/cos (40)`
Reminder of property of complementary arcs:
`cos (pi/2 - x) = sin x`
`cos (40) = cos (90 - 50) = sin (50)`
Therefor:
`P = sin (50)/sin (50) = 1`