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sin^2(3^@)+sin^2(6^@)+sin^2(9^@)+...+sin...

`sin^2(3^@)+sin^2(6^@)+sin^2(9^@)+...+sin^2(84^@)+sin^2(87^@)+sin^2(90^@)=`

A

1) `31/2`

B

2) `39/2`

C

3) `59/2`

D

4) 36

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