Q. 115.0( 1 Vote )

# Mark the Correct alternative in the following:If sin α + sin β = a and cos α – cos β = b, then A.B. C. D. None of these

Answer :

Given, sin α + sin β = a and cos α – cos β = b, then the value of

Consider sin α + sin β = a

As per the expansion of

Now , ----- (1)

Similarly, cos α - cos β = b

As per the expansion of

Now ------ (2)

By dividing equation (1) with (2) we get,

[As ]

Therefore the answer is option B.

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