Saturday

March 28, 2015

March 28, 2015

Posted by **Leah** on Monday, October 3, 2011 at 6:33pm.

All I need is an example to work off I was absent today from Pre-Calc and I have homework to do and no explanation with them-Please help with this one Thank you

- Pre-Calc -
**Steve**, Monday, October 3, 2011 at 11:51pmwhat the heck is a rectangular equation?

- Pre-Calc -
**Steve**, Monday, October 3, 2011 at 11:55pmhmm. you have given a polar coordinates equation, and want it y = f(x)?

cos theta = x/r

sin theta = y/r

r^2 = x^2 + y^2

r^2 = (2 cos t + 3 sin t)^2

= 4 cos^2 t + 12 sin t cos t + 9 sin^2 t

= 4 x^2/r^2 + 12xy/r^2 + 9y^2/r^2

r^4 = 4x^2 + 12xy + 9y^2

so, *x^2 + y^2)^2 = 4x^2 + 12xy + 9y^2

Not a pretty sight. The curve is cool, though

**Answer this Question**

**Related Questions**

Pre-Calculus - Can you show me how to find the rectangular equation: r=2cos(...

Pre-Calculus - Please check: 1.Find polar equation of x^2 + y^2 = 10y r^2 for x^...

Pre-Calc - Find all solutions of the equation in the interval [0, 2pi). Show all...

Pre-Calc - if (0,-7) lies on the terminal side of angle theta in standard ...

Pre-Calc/Math - if (0,-7) lies on the terminal side of angle theta in standard ...

pre calc trig check my work please - sin x + cos x -------------- = ? sin x sin ...

math pre-calc - find an expression for sin (5 theta) as a fifth degree ...

pre calc - theta=sin^-1 (5/13) ; (x,y)=(-3,1) how do u find the coordinates of x...

Trig/pre-calc - r=8cos(theta)+5sin(theta), convert the polar equation into a ...

Pre-calc PLEASE HELP! - Calculate the exact values of the cot(theta) and sin(...