Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

If cosec A = 10, then what is the value of 20 sin A + $9\sqrt{11}$ sec A ?

Given that A is an acute angle ?

Options:

23

34

32

30

Correct Answer:

32

Explanation:

cosec  A =  \(\frac{10 }{1}\)

{ cosec A =  \(\frac{H}{P}\) }

P² + B² = H²

1² + B² = 10²

B = 3\(\sqrt {11 }\)

Now,

20 sinA + 9\(\sqrt {11 }\) secA

= 20 × \(\frac{P}{H}\)  + 9\(\sqrt {11 }\)× \(\frac{H}{B}\)

 = 20 × \(\frac{1}{10}\)  + 9\(\sqrt {11 }\)× \(\frac{10}{3√11}\)

= 2 + 30

= 32