Aspire Faculty ID #3635 · Topic: NIMCET 2012 · Just now
NIMCET 2012

If $\sin^2 x = 1 - \sin x$, then $\cos^4 x + \cos^2 x$ is equal to:

Solution

From the given equation: 
$\sin^2 x = 1 - \sin x$ 
So: $\cos^2 x = 1 - (1 - \sin x)$ 
$\cos^2 x = \sin x$ 

$\cos^4x+\cos^2x$
=$\sin^2 x + \sin x$
$ = 1$ 

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