`( cos 80^(@))/( sin 10^(@)) + cos 59^(@) "cosec "31^(@)` का मान ज्ञात करो ।

Explanation

`( cos 80^(@))/( sin 10^(@))+ cos 59^(@) " cosec "31^(@)`
` =( cos (90^(@)-10^(@)))/( sin 10^(@))+ cos 59^(@) " cosec "(90^(@)-59^(@))`
`=( sin 10^(@))/( sin 10^(@)) + cos 59^(@) sec 59^(@) =( sin 10^(@))/( sin 10^(@))+ ( cos 59^(@))/( cos 59^(@))=1+1=2`