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If 2 $cos^2x$ - $cosx$ = 1 , what is the value of $x$ ?

1 Answer

Apr 2, 2016

$x=0$

Explanation:

As we know:

$cos 0 =1$

Put $x=0$ in equation:

$2cos^(2)0-cos0=1$

$2*1-1=1$

$1=1$

$L.H.S=R.H.S$

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