If A lies in the second quadrant and 3tan A + | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) Given $3	an A + 4 = 0$,we have $	an A = -\frac{4}{3}$.Since $A$ lies in the second quadrant,$\sin A$ is positive and $\cos A$ is negative.Using

Vedclass · Accepted Answer

$\frac{23}{10}$

Vedclass · Answer

(D) Given $3	an A + 4 = 0$,we have $	an A = -\frac{4}{3}$.Since $A$ lies in the second quadrant,$\sin A$ is positive and $\cos A$ is negative.Using the identity $\sec^2 A = 1 + 	an^2 A$,we get $\sec^2 A = 1 + (-\frac{4}{3})^2 = 1 + \frac{16}{9} = \frac{25}{9}$.Thus,$\sec A = -\frac{5}{3}$ (since $\cos A$ is negative in the second quadrant),which implies $\cos A = -\frac{3}{5}$.Also,$\sin A = 	an A 	imes \cos A = (-\frac{4}{3}) 	imes (-\frac{3}{5}) = \frac{4}{5}$.Finally,$\cot A = \frac{1}{	an A} = -\frac{3}{4}$.Substituting these values into the expression $2\cot A - 5\cos A + \sin A$:$= 2(-\frac{3}{4}) - 5(-\frac{3}{5}) + \frac{4}{5}$$= -\frac{3}{2} + 3 + \frac{4}{5}$$= \frac{-15 + 30 + 8}{10} = \frac{23}{10}$.

If $A$ lies in the second quadrant and $3\tan A + 4 = 0,$ the value of $2\cot A - 5\cos A + \sin A$ is equal to

Similar Questions

The minimum value of $\cos 2\theta + \cos \theta$ for real values of $\theta$ is

$\left( {1 + \cos \frac{\pi }{8}} \right)\,\left( {1 + \cos \frac{{3\pi }}{8}} \right)\,\left( {1 + \cos \frac{{5\pi }}{8}} \right)\,\left( {1 + \cos \frac{{7\pi }}{8}} \right) = $

If $\tan x = \frac{b}{a},$ then $\sqrt {\frac{{a + b}}{{a - b}}} + \sqrt {\frac{{a - b}}{{a + b}}} = $

$\tan \left( \frac{\pi }{4} + \theta \right) - \tan \left( \frac{\pi }{4} - \theta \right) = $

$\cot (45^\circ + \theta ) \cot (45^\circ - \theta ) = $

Vedclass Test Series

Exam Paper Generator

Online Exam Module