SOLUTION: find the exact value of tan315 using a sum or difference identity.

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Question 548441: find the exact value of tan315 using a sum or difference identity.
Answer by lwsshak3(11628) About Me  (Show Source):
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find the exact value of tan315 using a sum or difference identity.
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tan(315)=tan(360-45)=(tan 360-tan 45)/(1+tan 360*tan 45)
tan 360º=0
tan 45º=1
(tan 360-tan 45)/(1+tan 360*tan 45)
(0-1)/(1+0*1)=-1/1=-1
ans:
tan 315º=-1