Posted by Pre Calculus on Sunday, November 15, 2009 at 10:07pm.
I covered this previously.
Sin(theta)=sin(theta+360) in degrees
Sin(-theta)=sin(Theta) in degrees
sin(-20)=-sin(20) =-sin(20+360)=-sin(380)
then...
Tan(-theta)=-tan(theta).
Your refusal to post some sort of a meaningful name in the name box is not helping you get meaningful assistance.
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