Regular polygons - class-VIII

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Question 1 of 38

If $A+B=\dfrac{\pi}{3}$ and $\cos{A}+\cos{B}=1$, then which of the following is true

Select Your Answer:

$\cos{\left(A-B\right)}=\dfrac{1}{3}$

$\left|\cos{A}-\cos{B}\right|=\sqrt{\dfrac{2}{3}}$

$\cos{\left(A-B\right)}=-\dfrac{1}{3}$

$\left|\cos{A}-\cos{B}\right|=\dfrac{1}{2\sqrt{3}}$

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