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Consider the following : 1. (cos 75^(@...

Consider the following :
1. `(cos 75^(@))/(sin 15^(@)) + (sin 12^(@))/(cos 78^(@)) - (cos 18^(@))/(sin 72^(@)) =1`
2. `(cos 35^(@))/(sin 55^(@)) - (sin 11^(@))/(9cos 79^(@)) + cos 28^(@) "cosec" 62^(@) =1`
3. `(sin 80^(@))/(cos 10^(@)) - sin 59^(@).sec 31^(@) =0`
Which of the above are correct ?

A

1 and 2 only

B

2 and 3 only

C

1 and 3 only

D

1, 2 and 3

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