Saturday

March 28, 2015

March 28, 2015

Posted by **Abbey** on Tuesday, May 4, 2010 at 6:22pm.

x = sec Q

y = cos Q

x^2 + y^2 = 1/cos^2 + sin^2/cos^2 =

x^2(1 +sin^2) = x^2(2-cos^2)

x^2(2-1/x^2) = 2x^2 - 1

x^2 - y^2 = 1

My teacher said to use secant*cosine = 1. Please explain!!

- Math -
**Reiny**, Tuesday, May 4, 2010 at 6:39pmIsn't sec x = 1/cosx ??

so isn't (secQ)(cosQ)

= (1/cosQ)(cosQ) = 1 ???

so we know

secQ(cosQ) = 1

xy=1

looks like we got our equation!

**Answer this Question**

**Related Questions**

Math - Eliminate the parameter and write the corresponding rectangular equation ...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...

tigonometry - expres the following as sums and differences of sines or cosines ...

Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...

math - Eliminate the parameter (What does that mean?) and write a rectangular ...

Math - Calculus - The identity below is significant because it relates 3 ...

algebra - Can someone please help me do this problem? That would be great! ...

trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...

pre-cal - Simplify the given expression........? (2sin2x)(cos6x) sin 2x and cos ...

calculus - Differentiate. y= (cos x)^x u= cos x du= -sin x dx ln y = ln(cos x)^x...