Question

find the value of - tan 225 degree​

Answer 1

tan 225=tan(45+180)

=tan 45

=1

Answer 2

Given :

$-\tan 225^\circ$

To find : the value =?

Solution :

As tan is negative,

And we know that tan is negative in second and fourth quadrant.

So, according to second quadrant , we will use $(\pi +\theta)$ :

$\tan 225^\circ=\tan (180^\circ +45^\circ)=\tan 45^\circ = 1$

Hence, the value of $-\tan 225^\circ$ is 1.