How would you solve tan(-335) without using a calculator? I got it to tan(25) but that's not one of the ones on our chart, and I'd use a sum or difference identity but we never learned one for tangent, if one exists.

Question

How would you solve tan(-335) without using a calculator?  I got it to tan(25) but that's not one of the ones on our chart, and I'd use a sum or difference identity but we never learned one for tangent, if one exists.

bobpursley · Answer

I don't see a solution without a calculator.

drwls · Answer

Assuming the angles are in degrees, tan (-335) = -tan 25 Use tan (a + b) = (tana + tanb)/[1 - (tana*tanb)] I don't see a suitable combination of a and b, either.