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OJASWI KOTHARI

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· 1 Months ago

HOW? (Question: 326253.0 )

EXPLAIN

Question:

If $\sin α + s i n β = a$ and $\cos α + \cos β = b$ then cos $(α + β)$ is equal to

Options:

A)

$\frac{b^{2} - a^{2}}{b^{2} + a^{2}}$

B)

$\frac{b^{2} + a^{2}}{{2 b}^{2} + a^{2}}$

C)

$\frac{a^{2} - b^{2}}{b^{2} + a^{2}}$

D)

$\frac{b^{2} + a^{2}}{{2 (b}^{2} + a^{2})}$

Solution:

Ans: (a)

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