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Use the unit circle and the fact that sine is an odd function to find the following.

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if sinA=-1/3 then find sin(-A)
asked Feb 26, 2013 in TRIGONOMETRY by rockstar Apprentice

2 Answers

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  sin A = – 1/3

Even-Odd Identities

sin(– A)  = – sin A

sin(– A)  = – (– 1/3)      ( given  sin A = – 1/3)

sin(– A)  = 1/3

 

           

answered Mar 7, 2013 by hussy Rookie
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if sinA=-1/3 then sin(-A)=-sinA

Recall: even-odd identity sin(-x)=-(sinx)

sin(-A)=-sinA 

Substitute sinA =-1/3 in the equation.

sin(-A)=-(-1/3)

sin(-A)=1/3.

answered Mar 7, 2013 by diane Scholar

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