Solve 8cos(5x) = 4 for

Show that cos 4 alpha =8cos^4alpha - 8cos^2alpha + 1
1. 1 answer
2. asked by Joshua
3. 133 views
Find all solutions on the interval [0.2pi)A) -3sin(t)=15cos(t)sin(t) I have no clue... b) 8cos^2(t)=3-2cos(t) All i did was move
1. 1 answer
2. asked by Dan
3. 841 views
Prove thatcos4x=8cos^4x-8cos^2x+1 so I'm guessing you begin with the left side cos4x=cos2(2x) then im kinda lost
1. 2 answers
2. asked by Natash
3. 1,289 views
Prove that it is an identity: cos (4x)=8cos^4(x)-8cos^2(x)+1
1. 1 answer
2. asked by Anonymus
3. 2,035 views
If x=2cos (z) and y= sin (z), then d^2y/dx^2=?What I got -sin (z) / -8cos (z)*sin (z) simplifies to 1/8cos (z) I don't think I'm
1. 1 answer
2. asked by Liam
3. 450 views
Does anybody know how I can graph these on wolfram? x=cos(8cos(t))sin(t),y=sin(8cos(t))sin(t),z=cos(t).I type as it on
1. 3 answers
2. asked by Anonymous
3. 449 views
Solve for dD(t)= -8cos (pi(t)/30)+8
1. 2 answers
2. asked by Chris
3. 422 views
how can i solve for y value with this equationf(x)=-8cos(pi/30(x-y))+8
1. 4 answers
2. asked by Chris
3. 352 views
how do i solve for t and turn this equation into a sin functiond(t)=-8cos(pi(t)/30)+8
1. 2 answers
2. asked by Chris
3. 381 views
14.8cos(27.8)(29cos(x))+14.8sin(27.8)(29sin(x))=22How do you solve for x?
1. 1 answer
2. asked by Emma
3. 485 views