(tan² theta)(cos² theta) = 1-cos² theta solve that
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Step-by-step explanation:
(tan theta = sin theta /cos theta )
LHS
sin^2 theta /cos^2 theta x cos^2 theta
= sin^2 theta
( cos^2 +sin^2 = 1 )
sin^2 theta = 1- cos^2 theta
Hence proved
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