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September 18, 2014

September 18, 2014

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!

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