w=cos(theta) +(adsbygoogle = window.adsbygoogle || []).push({}); isin(theta) where 0<theta<pi

if the complex number w^2 + (5/w) -2 = 0 is purely imaginary, show that 2cos^2 x + 5 cos (theta) -3=0.

Hence, find w.

any input would be appreciated, thx.

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# Complex number proof

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