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amit kumar

· started a discussion

· 1 Months ago

Wrong question (Question: 246827.0 )

What is the correct question

Question:
If α + β - \(\gamma\) = \(\pi\), then sin2 α+ sin2 β – sin2 \(\gamma\) = ?
Options:
A) 2 sin \(\alpha\) sin \(\beta\) cos \(\gamma\) 
B) 2 cos \(\alpha\) cos \(\beta\) cos \(\gamma\) 
C) 2 sin \(\alpha\) sin \(\beta\) sin \(\gamma\) 
D) 2 cos \(\alpha\) cos \(\beta\) sin \(\gamma\) 
Solution:

Ans: (a)  


SUI GENERIS

· commented

· 1 Months ago

put alpha=45 , beta=45 & gama=90 , option B is right, wholly mess.

Raj keshri

· commented

· 1 Months ago

put alpha=beta=90 and gama=0 ..the question will boil down to 2..then check the options only option a given 2
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