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The value of sin (pi/18)+sin ((pi)/(9))+...

The value of `sin (pi/18)+sin ((pi)/(9))+sin 2(pi/9)+sin 5(pi/18)` is given by

A

`sin (7 pi/18)+sin (4 pi/9)`

B

1

C

`cos (pi/6)+cos (3 pi/7)`

D

`cos (pi/9)+sin (pi/9)`

Text Solution

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