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The value of sec^2 28^@-cot^2 62^@+ sin^...

The value of `sec^2 28^@-cot^2 62^@+ sin^2 60^@+ cosec^2 30^@` is equal to:
`sec^2 28^@-cot^2 62^@+ sin^2 60^@+ cosec^2 30^@` का मान किसके बराबर है ?

A

a)`7/2`

B

b)3

C

c)`19/4`

D

d)`23/4`

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