Q. 75.0( 1 Vote )

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Answer :


Expanding along the second row



|A| = sinβ (cosα×cosα sinβ + sinα × sinα sinβ) + cosβ (cosα cosβ × cosα + sinα×sinα cosβ) – 0


|A| = sin2 β (cos2α + sin2α) + cos2β (cos2α + sin2α)


|A| = sin2 β (1) + cos2β (1)


|A| = sin2 β + cos2β


|A| = 1


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