Thursday

November 20, 2014

November 20, 2014

Posted by **jared** on Monday, November 7, 2011 at 12:29am.

(sinx+sin2x)/(1+cosx+cos2x)=tan x

(cos3x/sinx)+(sin3x/cosx)=2cot2x

tan2x=(2/cotx-tanx)

theses are due in the am. Fastness would be great?

- Trig -
**Steve**, Monday, November 7, 2011 at 1:21pmYou can't prove a function. You can prove an identity.

Using s for sinx, c for cosx, t for tanx, to make things look less cumbersome:

(s+2sc)/(1+c+2c^2 - 1) = t

(s+2sc)/(c + 2c^2) = t

s(1+2c)/[c(1+2c)] = t

s/c = t

t = t

**Answer this Question**

**Related Questions**

Trig - help please!: (sinx + sin2x +sin3x) / (cosx + cos2x + cos3x) = tan2x

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

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

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

Trig - Verify the identity: tanx(cos2x) = sin2x - tanx Left Side = (sinx/cosx)(...

Precalculus/Trig - I can't seem to prove these trig identities and would really ...

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

Math please help quick - Which of the following are identities? Check all that ...

Math - Im really struggling with these proving identities problems can somebody ...

Pre-calc - prove the identity: (cosx)(tanx + sinx cotx)=sinx+cos(squared)x i ...