a vertical rod is fixed in a horizontal rectangular field ABCD The angular elevations of its top from - Maths - Some Applications of Trigonometry

Question

a vertical rod is fixed in a horizontal rectangular field ABCD The
angular elevations of its top from A, B, C, D are a , b ,c and d
respectively Show that cot2a- cot2b =
cot2d - cot2c ??

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a vertical rod is fixed in a horizontal rectangular field ABCD. The angular elevations of its top from A, B, C, D are a , b ,c and d respectively. Show that cot2a- cot2b = cot2d - cot2c ??

a vertical rod is fixed in a horizontal rectangular field ABCD. The angular elevations of its top from A, B, C, D are a , b ,c and d respectively. Show that cot²a- cot²b = cot²d - cot²c ??