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The value of the expression (tan^2 20^0-...

The value of the expression `(tan^2 20^0-sin^2 20^0)/(tan^2 20^0+sin^2 20^0)` is__________

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`(tan^2 20^@-sin^2 20^@)/(tan^2 20^@ sin^2 20^@)`
`=1/sin^2 20^@ - 1/tan^2 20^@`
`=cosec^2 20^@ - cot^2 20^@`
`=1`
As, `1` is not a surd and a prime number, we can reject option `b` and `c`.
Also, `1` is integer and not a composite number.
So, optiopn `d` is the correct option.
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