sintheta+ sin(π+theta)+ sin(2π+ theta) =
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sintheta+ sin(π+theta)+ sin(2π+ theta)
=sin theta - sin theta +sin theta
= sin theta
REASON : (1) sin(π+theta) lies in 3rd quadrant, so the value of sin(π+theta) is -sintheta
(2) And sin(2π+ theta) lies in 1st quadrant so the value of sin(2π+ theta) is positive
that is +sintheta
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