Saturday

December 20, 2014

December 20, 2014

Posted by **Josh G.** on Sunday, October 21, 2012 at 1:30am.

6cos^2-3

and

(cosx +sinx)(cosx-sinx)

- Trigonometry -
**Bosnian**, Sunday, October 21, 2012 at 2:00amcos ( 2 x ) = 2 cos ^ 2 ( x ) - 1

6 cos ^ 2 ( x ) - 3 =

3 [ 2 cos ^ 2 ( x ) - 1 ] =

3 sin ( 2 x )

- Trigonometry -
**Reiny**, Sunday, October 21, 2012 at 10:27amsecond one:

(cosx +sinx)(cosx-sinx)

=(cosx +sinx)(cosx-sinx) * (cosx + sinx)/(cosx + sinx)

= (cos^2 x + 2sinxcosx + sin^2 x)/(cos^2 x - sin^2 x)

= (1 + sin 2x)/cos 2x

or

1/cos 2x + sin 2x/cos 2x

= sec 2x + tan 2x

**Answer this Question**

**Related Questions**

Trigonometry Check - Simplify #3: [cosx-sin(90-x)sinx]/[cosx-cos(180-x)tanx] = [...

Trig........ - I need to prove that the following is true. Thanks (cosx / 1-sinx...

Trigonometry. - ( tanx/1-cotx )+ (cotx/1-tanx)= (1+secxcscx) Good one! ...

trigonometry - can i use factoring to simplify this trig identity? the problem ...

Pre-Calc - Trigonometric Identities Prove: (tanx + secx -1)/(tanx - secx + 1)= ...

Math - Verify the identity . (cscX-cotX)^2=1-cosX/1+cosX _______ sorry i cant ...

maths - trigonometry - I've asked about this same question before, and someone ...

Math - Pre- Clac - Prove that each of these equations is an identity. A) (1 + ...

trigonometry - how do i simplify (secx - cosx) / sinx? i tried splitting the ...

Mathematics - Trigonometric Identities - Prove: (tanx)(sinx) / (tanx) + (sinx...