Posted by **Katie** on Tuesday, June 3, 2008 at 9:12pm.

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.

- Adv. Alg/Trig -
**bobpursley**, Tuesday, June 3, 2008 at 9:32pm
I don't see a solution without a calculator.

- Adv. Alg/Trig -
**drwls**, Wednesday, June 4, 2008 at 6:25am
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.

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