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SAURAV KUMAR

· started a discussion

· 1 Months ago

short trick if any (Question: 316060.0 )

have any of u guyz has a short trick
if yes plzz mention it in comment

Question:

If sin α + sin β = α and cos α + cos β = b, then cos (α + β) is equal to –

Options:
A)

  

B)

  

C)

  

D)

  

Solution:

Ans: (a)

  

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
In such questions , we will simply square and then add / subtract equations.
This is one of the tricks that you can use.

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