Question

giải các pt sau:

a,\(4sin^23x+2\left(\sqrt{3}+1\right)cos3x-\sqrt{3}=4\)

b, \(cos2x+9cosx+5=0\)

c,\(4cos^2\left(2-6x\right)+16cos^2\left(1-3x\right)=13\)

d, \(\frac{1}{cos^2x}-\left(1+\sqrt{3}\right)tanx-1+\sqrt{3}=0\)

e, \(\frac{3}{cosx}+tan^2x=9\)

f, \(\frac{1}{sin^2x}=cotx+3\)

g,\(9-13cosx+\frac{4}{1+tan^2x}=0\)

h,\(\frac{1}{cos^2x}+3cot^2x=5\)

i, \(cos2x-3cosx=4cos^2\frac{x}{2}\)

k, \(2cos2x+tanx=1\)

Answer 1

https://i.imgur.com/mVqlQRs.jpg

Answer 2

https://i.imgur.com/tXKeJRL.jpg

Answer 3

https://i.imgur.com/kuIPxun.jpg

Answer 4

https://i.imgur.com/GvaoqaH.jpg

Answer 5

https://i.imgur.com/BwiwXnU.jpg

Answer 6

Sorry mk gửi lộn

Answer 7

https://i.imgur.com/Lbc8S4z.jpg

Answer 8

https://i.imgur.com/fCpIsR7.jpg

Answer 9

https://i.imgur.com/lzIzift.jpg

Answer 10

https://i.imgur.com/jPDOJMR.jpg

Answer 11

https://i.imgur.com/yBXOeSi.jpg

Answer 12

https://i.imgur.com/5gfwZ5F.jpg