Test Index

NCERT Class XI Mathematics - Trigonometric Functions - Solutions

© examsnet.com
Question : 12 of 61
Marks: +1, -0
tan x = 512-\frac{5}{12} , x lies in second quadrant.
Solution:  
tan x = 512-\frac{5}{12} gives cot x = 125\frac{-12}{5}
sec2\sec^2 x = 1 + tan2\tan^2 x ⇒ sec2\sec^2 x = 1 + 25144\frac{25}{144} = 169144\frac{169}{144}
⇒ sec x = ± 1312\frac{13}{12} ⇒ sec x = - 1312\frac{13}{12} [since x lies in second quadrant]
sec x = 1312-\frac{13}{12} gives cos x = 1213\frac{-12}{13} , sin x = tan x × cos x
⇒ sin x = (512)\left(-\frac{5}{12}\right) × (1213)\left(\frac{-12}{13}\right) = 513\frac{5}{13} , sin x = 513\frac{5}{13} gives cosec x = 135\frac{13}{5}
© examsnet.com
Go to Question: