f. cotA= en 31. If cot at then (sin...
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f. cotA= en 31. If cot at then (sin A +cos A) cosec A is? RRB NTPC (Phase I) 2016 (1) (2) (3) (4) 2

11th - 12th Class
Maths
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31. ( ( 2) ) Given, ( cot A=frac{12}{5} ) then by Pythagoras Then ratio [ begin{aligned} sin A &=frac{5}{13} cos A &=frac{12}{13} text { and } operatorname{cosec} A=frac{13}{12} end{aligned} ] Put the values in given question ( (sin A+cos A) times operatorname{cosec} A ) [ left(frac{5}{13}+frac{12}{13}right) times frac{13}{12}=frac{17}{12} ]
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