Without using the unit circle, how would I know what angle #tanx-1=0# represents?

1 Answer
David G.
Oct 2, 2017

Adding #1# to both sides leads to the equation: #tanx=1#. We are looking for the angle whose tan is 1. We can rewrite as #x=tan^-1(1)#. A calculator could solve this, or you could simply remember that #tan^-1(1)=\pi/4# radians or #45^o#.

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