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: sec^(2)60^(@)-1=?

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: If tan^(2)45^(@)-cos^(2)30^(@)=x sin45^(@) cos 45^(@) " then " x =?

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: (sec 30^(@))/("cosec"60^(@))=?

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: tan 10^(@) tan15^(@)tan75^(@)tan80^(@)=?

Choose the correct answer in each of the following questions: ("cosec"theta-cot theta)^(2)=?