• Jan 20th 2013, 01:26 PM
M670
Using your calculator, find a solution for http://webwork.mathstat.concordia.ca...631e7925d1.png in RADIANS (if possible). If no solution exists, enter NONE.

Though many solutions may exist, you should only provide ONE answer (which comes from using the inverse trigonometric function keys on your calculator).

I got what I believe to be the answer but I am being told its wrong

so i take $\tan (\theta-4)=0.25 \rightarrow \tan^-1( \tan (\theta-4)=\tan^-1(0.25)\rightarrow \theta-4=\tan^-1(0.25) \rightarrow \theta=18.03624347$

Are my calculation correct?
• Jan 20th 2013, 01:48 PM
Plato
Quote:

Originally Posted by M670
Using your calculator, find a solution for http://webwork.mathstat.concordia.ca...631e7925d1.png in RADIANS (if possible). If no solution exists, enter NONE.
so i take $\tan (\theta-4)=0.25 \rightarrow \tan^-1( \tan (\theta-4)=\tan^-1(0.25)\rightarrow \theta-4=\tan^-1(0.25) \rightarrow \theta=18.03624347$
Are my calculation correct?

NO

$\arctan(0.25)=0.24498$
• Jan 20th 2013, 01:59 PM
M670
Quote:

Originally Posted by Plato
NO

$\arctan(0.25)=0.24498$

When I calculate $\arctan(0.25)=14.036243468$
• Jan 20th 2013, 02:01 PM
Plato
When I calculate $\arctan(0.25)=14.036243468$
ahh ha now it works ... $\theta = 4.2448$