UPSC CDS 2 2023 Math Paper

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Question : 69 of 100

Marks: +1, -0

What is ‌

x2−y2−z2−2yz

x2+y2−z2+2xy

+ ‌

x2−y2−z2−2yz

x2−y2+z2−2xz

equal to ?

‌
x
x‌+‌y−z
‌
y‌+‌z
x‌+‌y−z
‌
2x
x‌+‌y−z
‌
2y‌+‌2z
x‌+‌y−z

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