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Q.

Sin240 + sin320 + sin2040 + sin2120 =

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a

2

b

1

c

-1

d

0

answer is C.

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Detailed Solution

    Sin24 + sin32 + sin204 + sin212  =sin24°+sin180°+24°+sin30+sin180°+32° =sin24°-sin24°+sin32°-sin 32° =0

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