Question

solve
cos2x(2cosx+1)=0

Answer 1

2cos(x)cos(2x)+cos(2x)=0

Answer 2

2cos(a)cos(b)=cos(a+b)+cos(a-b)

Answer 3

Just keep the equation as it is.

\[\cos(2x)(2\cos(x)+1)=0\]This means that either
\[\cos(2x)=0\]
or
\[\ 2cos(x)+1=0\]
Ought to be fairly simple onwards.

Answer 4

\[\cos^2 x(2\cos x + 1) = 0?\]

Answer 5

nice work....@Uniquebum

Answer 6

cos(2x)=0
\[2x=n*\pi/2 \implies x=n*\pi/4\]

Answer 7

n=1,2,3..

Answer 8

2cosx+1=0
2cosx=-1
cosx=-1/2