- #1

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## Homework Statement

Alright, so I am going through the solutions to one problem that has me stumped, and initial instinct tells me it is wrong, however, I figured I would get clarification.

## The Attempt at a Solution

[tex]sin(2t)=cos(2t)[/tex]

[tex]tan(2t)=1[/tex]

[tex]2t=\pi{/}4, 5\pi{/}4[/tex]

However, the book states both positive and negative values, rather than just positive. It's either not correct, or not clicking. tan(-π/4)=-1, not 1..