Radians

**M670** · Jan 20th 2013, 12:26 PM

Using your calculator, find a solution for

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).

when

(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?

**Plato** · Jan 20th 2013, 12:48 PM

Originally Posted by M670

Using your calculator, find a solution for

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

$\arctan(0.25)=0.24498$

**M670** · Jan 20th 2013, 12:59 PM

Originally Posted by Plato

NO

$\arctan(0.25)=0.24498$

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

**Plato** · Jan 20th 2013, 01:01 PM

Originally Posted by M670

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

Put your calculator in radian mode.

**M670** · Jan 20th 2013, 01:05 PM

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

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