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11 (a) In the figure ( 1 ) given below, \( \Delta \mathrm { ABC } \) is right-angled at \( \mathrm { B } \) and \( \Delta \mathrm { BRS } \) is right-angled
at \( \mathrm { R } \). If \( \mathrm { AB } = 18 \mathrm { cm } , \mathrm { BC } = 7.5 \mathrm { cm } , \mathrm { RS } = 5 \mathrm { cm } , \angle \mathrm { BSR } = x ^ { \circ } \) and \( \angle \mathrm { SAB } = y \), then
find : (i) \( \tan x ^ { \circ } \quad \) (ii) \( \sin y ^ { \circ } \) (b) In the figure (2) given below, \( \Delta \mathrm { ABC } \) is right angled at \( \mathrm { B } \) and \( \mathrm { BD } \) is perpendicular
to AC. Find (i) \( \cos \angle \mathrm { CBD } \quad \) (ii) cot \( \angle \mathrm { ABD } \) is \( e ^ { x } \)
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