1 ) two measurements of meme angle ? 2 ) 3 )
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1) The difference of the 2 angles is NOT a multiple of $\displaystyle 2\pi$; so they are not measurements of the same angle. 2) $\displaystyle (2x+1)^2=(x-1)^2 \implies$ x=0 or x=-2. 3) $\displaystyle tan (x)=1 \implies x=\frac{\pi}{4}+n\pi$
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