Radians

Printable View

January 20th 2013, 12:26 PM
M670

Radians

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).

http://webwork.mathstat.concordia.ca...706f2789c1.png when http://webwork.mathstat.concordia.ca...c0a1902111.png (round your answer to four decimal places)

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?
January 20th 2013, 12:48 PM
Plato

Re: Radians

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

$\arctan(0.25)=0.24498$
January 20th 2013, 12:59 PM
M670

Re: Radians

Quote:

Originally Posted by Plato

NO

$\arctan(0.25)=0.24498$

When I calculate $\arctan(0.25)=14.036243468$
January 20th 2013, 01:01 PM
Plato

Re: Radians

Quote:

Originally Posted by M670

When I calculate $\arctan(0.25)=14.036243468$

Put your calculator in radian mode.
January 20th 2013, 01:05 PM
M670

Re: Radians

ahh ha now it works ... $\theta = 4.2448$