1.

The value of sin 1 + sin 5 + sin 9 + .... + sin 89 is

A. <table><tr><td rowspan="2">11</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><td align="center">2</td></table>
B. 11
C. <span style=" text-decoration: overline;">2</span>
D. 11
E. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>11</center></td></tr><td align="center"> <span style=" text-decoration: overline;">2</span></td></table>
Answer» B. 11


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