## aaronq Group Title what does tan2x equal when, x=-60 degrees? one year ago one year ago

1. max0236

2*-60 is 120 so cos(-120) = $\frac{ 1 }{ 2 }$ and sin(-120) = $\frac{ -\sqrt{3} }{ 2 }$ tan is opp/adj which will then give you an exact answer of $\sqrt{3}$

2. max0236

tan = sin/cos

3. aaronq

thanks so much, i wasn't sure if i could just multiply 2 by 60, or if i had to use the identity 2tanx/1-tan^2x

4. max0236

as long as the 2 and x are together you are fine tan(2x)

5. aaronq

what if it's tan2x? it didn't necessarily specify tan(2x)

6. max0236

That is fine also if the 2 was outside for example 2tan(x) then it would be different

7. aaronq

ok sweet, thanks (Y)