sin theta =-1/2 find theta using allied angles. a) theta is 210degree,b)330degree,c) both,d) non of this. with method.
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a) 210
sin theta = 1/2 when theta 30.
if you watch the sine curve, when does it casts an negative 30(for -1/2). after 180 half cycle completion, negative 30 at 210
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