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Two stations due south of a leaning tower which leans towards the north are at distances a and b from its foot. If $\alpha and\beta $ be the elevations of the top of the tower from these stations, its inclination $\theta $ to the horizontal is given by cot $\theta $ is equal to

$\left(A\right)\frac{bcot\alpha -acot\beta}{b-a}\phantom{\rule{0ex}{0ex}}\left(B\right)\frac{bcot\alpha +acot\beta}{b+a}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(C\right)\frac{acot\alpha -bcot\beta}{a-b}\phantom{\rule{0ex}{0ex}}\left(D\right)\frac{bcot\beta -acot\alpha}{a+b}$

Q.4 https://www.meritnation.com/ask-answer/question/a-man-notices-two-objects-in-a-straight-line-due-west-after/some-applications-of-trigonometry/5730968

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