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The value of sin 55^@-sin19^@+sin53^@-si...

The value of `sin 55^@-sin19^@+sin53^@-sin17^@` is always equal to

A

`cos 1^@`

B

`sin 1^@`

C

`tan 1^@`

D

`- cos 1^@`

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The correct Answer is:
A
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