Question 804433: Draw the Unit Circle and angle A and angle (pi + A). Explain from the Unit Circle how sin A is related to sin (pi+ A). Is it equal to sin (pi+ A)? Is it equal to minus sin (pi + A)? Is it equal to something else?
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! Draw the Unit Circle and angle A and angle (pi + A). Explain from the Unit Circle how sin A is related to sin (pi+ A). Is it equal to sin (pi+ A)? Is it equal to minus sin (pi + A)? Is it equal to something else?
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Adding π to A moves angle A from the top half to the bottom half of the unit circle or vise-versa, which changes the sign of sinA, but not its value. Reference angle does not change. In the top half(Q1& Q2)sinA>0, and in the bottom half(Q3&Q4),sinA<0) That is, sin(π+A)=-sinA
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