Here , you can use any way to find thetaSo, Sin theta=opposite side/ hypotenuse side=>Sin theta=4/5Now ,if Sin theta=0.8,then sin(theta+2pi)=sin (theta +4 pi)=Sin Theta=0.8,then Sin+sin(theta+2 pi)+sin(theta+4 pi)=3sin theta=2.4=>theta=2.4
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