Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

If $tan B =\frac{5}{3}$, what is the value of $\frac{cosec B + sin B}{cos B-sec B}$ ?

Options:

$-\frac{177}{125}$

$-\frac{59}{15}$

$\frac{59}{15}$

$\frac{177}{125}$

Correct Answer:

$-\frac{177}{125}$

Explanation:

tanB = \(\frac{5}{4}\) = \(\frac{P}{B}\)

Using pythagoras theorem ,

P2 + B2 = H2

52 + 32 = H2

H2 = 34

H = √34

Now ,

$\frac{cosec B + sin B}{cos B-sec B}$

= ( \(\frac{√34 }{5}\) + \(\frac{5 }{ √34}\) ) × ( \(\frac{3 }{√34}\) - \(\frac{√34 }{ 3}\) )

= ( \(\frac{34 +25 }{5√34}\)  × ( \(\frac{9 - 34 }{3√34}\)

= ( \(\frac{59 }{5\)  × ( \(\frac{-25 }{3}\) 

- \(\frac{177 }{125\)