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harshit

· started a discussion

· 1 Months ago

short (Question: 277524.0 )

kuch chota bta do yr.

Question:

If sin  α    +sin  β    = a and cos  α    + cos  β    = b then cos( α    +  β   ) is equal to?

Options:
A)

b2 - a2b2 + a2    

B)

b2+ a22b2 - a2    

C)

b2 + a2b2- a2    

D)

b2+ a22b2- a2    

Solution:

Ans: (a)

  

pallavi

· commented

· 1 Months ago

sir koi short trick nhi h eski

monika yadav

· commented

· 1 Months ago

put alpha=90 , beta-0

Sandeep Chahal

· commented

· 1 Months ago

put alpha=30 n beta=60 then cos(alpha+beta)=cos90 =0 it is satisfied only by option 1
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