Question

Without using trigonometric tables, evaluate :

`cos 35^circ/sin 55^circ`

Answer 1

`cos 35^circ/sin 55^circ`

= `cos (90^circ - 55^circ)/sin 55^circ`

= `sin 55^circ/sin 55^circ` [`because` sin (90-θ) = cos θ]

= 1