# Math Help - Corrected the error 7,8,9

1. ## Corrected the error 7,8,9

1 ) two measurements of meme angle ?

2 )

3 )

2. 1) The difference of the 2 angles is NOT a multiple of $2\pi$; so they are not measurements of the same angle.

2) $(2x+1)^2=(x-1)^2 \implies$ x=0 or x=-2.

3) $tan (x)=1 \implies x=\frac{\pi}{4}+n\pi$

3. Thank you