Question

Evaluate the following :

`cos 19^@/sin 71^@`

Answer 1

 Given that  `cos 19^@/sin 71^@`

`=> cos 19/sin 71 = cos(90 - 71)/sin 71`

`=> cos 19/sin 71 = sin 71/sin 71`

`=> cos 19/sin 71 = 1`

Since `cos (90 - theta) = sin theta`

Therefore `cos 19^@/sin 71^@` = 1