Posted by **Don** on Thursday, December 22, 2011 at 10:56pm.

Use reduction identities to determine if the following statement is true or false:

tan (A-B) = tan (B-A)

Is this starement True or False ?

- Trig -
**Reiny**, Thursday, December 22, 2011 at 11:18pm
easiest way:

let Ø be A-B, then B-A = -Ø

but we know tan (-Ø) = - tanØ

so tan(A-B) = tan(B-A) is false

or

LS = (tanA - tanB)/(1 + tanAtanB)

RS = (tanB-tanA)/(1+tanAtanB)

the LS is opposite the RS, not equal

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