Evaluate the following and justify your answer.
` sec 16^(@) cosec 74^(@) -cot 74^(@) tan 16^(@) `

Evaluate the following and justify your answer. sin 5^(@) cos 85^(@) +cos 5^(@) sin 85^(@)

Evaluate the following and justify your answer. (i) (sin ^(2) 15^(@) +sin ^(2) 75^(@) )/( cos ^(2) 36^(@) +cos ^(2) 54^(@))

Evaluate the following (sin 30^(@) +tan 45^(@) -cosec 60^(@) )/( cot 45^(@)+cos 60^(@) -sec 30^(@))

Evaluate the following (cos 45^(@))/( sec 30^(@) +cosec 60^(@))

Evaluate cosec 31^(@) -sec 59^(@)

Evaluate the following : (sin30^(@)+tan45^(@)-cosec60^(@))/(sec30^(@)+cos60^(@)+cot45^(@))

Find the values of cosec 60 ^(@) ,sec 60^(@) and cot 60^(@)

Evaluate the following (sec^(2) theta -1 ) (cosec ^(2) theta -1)

Evaluate the following (1+tan theta +sec theta ) ( 1+cot theta -cosec theta )

Evaluate the following (i) sin ( cosec ^(-1) 5/3)" "(ii) cot ( tan^(-1). 3/4)