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What is the value of (5 sin 75^@ sin 7...

What is the value of
`(5 sin 75^@ sin 77^@ + 2 cos 13^@ cos 15^@)/(cos 15^@ sin 77^@) - (7 sin 81^@)/(cos 9^@)` ?

A

`-1`

B

`0`

C

`1`

D

`2`

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