Quantitative Aptitude Geometry Quadrilaterals

ABCD ഒരു ചാക്രിക ചതുർഭുജം ആണെങ്കിൽ, cos²A – cos²B – cos²C + cos²D യുടെ മൂല്യം ഇതാണ്:

1

-1

2

1

3

0

4

2

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