1.

`"co s ec"^(2)60^(@)+sec^(2)60-cot^(2)60^(@)+tan^(2)30^(@)` का मान क्या होगा ?A. 5B. `5(1)/(2)`C. `5(2)/(3)`D. `5(1)/(3)`

Answer» Correct Answer - d
`co s ec^(2)60^(@) +sec^(2)60^(@)-cot^(2)60^(@)+tan^(2)30^(@)`
`=((2)/(sqrt(3)))^(2)+(2) ^(2)-((1)/(sqrt(3)))^(2)+((1)/(sqrt(3)))^(2)`
`=(4)/(3)+4-(1)/(3)+(1)/(3)`
`=(16)/(3)`
`=5(1)/(3)`


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