Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

If cosec θ + cot θ = x; what is the value of cosecθ.cotθ ?

Options:

 \(\frac{1}{4}\)(x2 -  \(\frac{1}{x^2}\))

2

-1

1

Correct Answer:

 \(\frac{1}{4}\)(x2 -  \(\frac{1}{x^2}\))

Explanation:

cosec θ + cot θ = x

⇒ cosec θ - cot θ = \(\frac{1}{x}\)

4cosecθ.cotθ = (cosecθ + cotθ)2 - (cosecθ - cotθ)2

⇒ 4cosecθ.cotθ = x2 - \(\frac{1}{x^2}\)

⇒ cosecθ.cotθ = \(\frac{1}{4}\)(x2 -  \(\frac{1}{x^2}\))