prove that (2cosx+1)(2cosx-1)= 1 +2cos2x

prove that(2cosx+1)(2cosx-1)= 1 +2cos2x
1. 2 answers
2. asked by adil
3. 1,070 views
Determine the concavity and find the points of inflection.y=2cosx + sin2x 0≤x≤2pi y'=-2sinx + 2cos2x y"=-2cosx-4sinx How do
1. 3 answers
2. asked by sh
3. 2,326 views
For the following equation, why cannot I not solve it? I keep getting an error.-- 2cosx - 3 = 0 -- I first isolated for "x"
1. 1 answer
2. asked by Anonymous
3. 1,258 views
tanx+secx=2cosx(sinx/cosx)+ (1/cosx)=2cosx (sinx+1)/cosx =2cosx multiplying both sides by cosx sinx + 1 =2cos^2x sinx+1 =
1. 0 answers
2. asked by shan
3. 1,030 views
Find the limit of(2cosx+3cosx-2)/(2cosx-1)as x tends to pi/3.
1. 1 answer
2. asked by Alex
3. 645 views
Find the volume of the solid obtained by rotating the region in the first quadrant enclosed by the curves y= tanx and y=2cosx
1. 1 answer
2. asked by tom
3. 700 views
h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 7 4 1 7 1 8 8I don't follow your work Reiny
1. 5 answers
2. asked by Kate RESPONSE
3. 692 views
Having trouble verifying this identity...cscxtanx + secx= 2cosx This is what I've been trying (1/sinx)(sinx/cosx) + secx = 2cosx
1. 2 answers
2. asked by Alex
3. 726 views
prove the identity(sinX)^6 +(cosX)^6= 1 - 3(sinX)^2 (cosX)^2 sinX^6= sinx^2 ^3 = (1-cosX^2)^3 = (1-2CosX^2 + cos^4) (1-cosX^2)
1. 0 answers
2. asked by JungJung
3. 953 views
Given that y=sin x ln (x+1),prove that(d^2 y)/(dx^2 )+y=2cosx/(x+1)-sinx/(x+1)^2
1. 1 answer
2. asked by lydiah
3. 480 views