ComedkTrigonometric Ratios And IdentitiesCOMEDK 2022MCQ+1 / -02022If \(\sin A+\sin B=a\) and \(\cos A+\cos B=b\), then \(\cos (A+B)\) equals?A\(\frac{a^2+b^2}{b^2-a^2}\)B\(\frac{2 a b}{a^2+b^2}\)C\(\frac{b^2-a^2}{a^2+b^2}\)D\(\frac{a^2-b^2}{a^2+b^2}\)Check AnswerClear SelectionReveal AnswerShow Explanation