Question

Evaluate the following:

`(sin 21^@)/(cos 69^@)`

Answer 1

Given that `(sin 21^@)/(cos 69^@)`

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

`=> (sin 21)/(cos 69) = sin(90 - 69)/cos 69`

`=> sin 21/cos 69 = cos 69/cos 69`

`=> sin 21/cos 69 = 1`