Polar to rectangular form

**cmr7** · December 15th 2008, 07:44 PM

How about this one?
r^2= sec^2(theta) - tan^2(theta)

**Mathstud28** · December 15th 2008, 07:48 PM

$\sec(x)\ne\frac{1}{\sin(x)}$

**cmr7** · December 15th 2008, 07:56 PM

Thank you!!!!!

**Soroban** · December 15th 2008, 08:02 PM

Hello, cmr7!

Someone created this problem as a joke . . .

Write in rectangular form: . $r^2\:=\: \sec^2\!\theta - \tan^2\!\theta$

We're expected to know this identity: . $\sec^2\!A - \tan^2\!A \:=\:1$

. . and this conversion: . $r^2 \:=\:x^2+y^2$

So: . $r^2 \:=\:\sec^2\!\theta - \tan^2\!\theta\;\text{ becomes: }\:r^2 \:=\:1 \quad\Rightarrow\quad x^2+y^2 \:=\:1$

**Mathstud28** · December 15th 2008, 08:06 PM

Originally Posted by Soroban

Hello, cmr7!

Someone created this problem as a joke . . .

Yeah, apparently for me.

**cmr7** · December 15th 2008, 08:08 PM

I am in the class right now so all this should be fresh on my mind and it got past me also. I am going on 4 night sin a row of studying for this final. Maybe I should just get some sleep now haha!

Thread: Polar to rectangular form

LinkBack

Thread Tools

Display

Polar to rectangular form

me too

Similar Math Help Forum Discussions

Rectangular to Polar Form?

Polar Equation to Rectangular Form

Converting from Polar form to Rectangular form

Rectangular into polar form

Polar to rectangular form.

Search Tags