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S(10) = cos'(pi)/(180) + cos'(3pi)/(180)...

`S_(10) = cos'(pi)/(180) + cos'(3pi)/(180) + "….." cos '(19pi)/(180)`

A

`(sin'pi/9cos'pi/18)/(sin'pi/90)`

B

`(sin'pi/18cos'pi/18)/(sin(pi/180))`

C

`(sin'pi/18cos'pi/9)/(sin(pi/180))`

D

`(cos'pi/18cos'pi/9)/(sin(pi/180))`

Text Solution

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The correct Answer is:
A
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