Choose the correct answer in each of the following questions:
`sec^(2)60^(@)-1=?`

Choose the correct answer in each of the following questions: sec^(2)10^(@)-cot^(2)80^(@)=?

Choose the correct answer in each of the following questions: "cosec"^(2)57^(@)-tan^(2)33^(@)=?

Choose the correct answer in each of the following questions: 3cos^(2)60^(@)+2cot^(2)30^(@)-5sin^(2)45^(@)=?

Choose the correct answer in each of the following questions: sin^(2)30^(@)+4cot^(2)45^(@)-sec^(2)60^(@)=?

Choose the correct answer in each of the following questions: cos^(2)30^(@)cos^(2)45^(@)+4sec^(2)60^(@)+(1)/(2)cos^(2)90^(@)-2tan^(2)60^(@)=?

Choose the correct answer in each of the following questions: (cos0^(@)+sin30^(@) +sin45^(@))(sin 90^(@) + cos60^(@)-cos45^(@))=?

Choose the correct answer in each of the following questions: If sec theta=(25)/(7) " then " sintheta=?

Choose the correct answer in each of the following questions: (2tan^(2)30^(@)sec^(2)52sin^(2)38^(@))/("cosec"^(2)70^(@)-tan^(2)20^(@))=?

Choose the correct answer in each of the following questions: (sec 30^(@))/("cosec"60^(@))=?

Choose the correct answer in each of the following questions: If 2x=sec A and (2)/(x)=tanA" then " 2(x^(2)-(1)/(x^(2)))=?