Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

If a sec θ = x and b tan θ = y, then find correct relation.

Options:

a2x2 - b2y2 = a2b2

b2x2 - a2y2 = a2b2

a2x2 + b2y2 = a2b2

b2x2 + b2y2 = a2b2

Correct Answer:

b2x2 - a2y2 = a2b2

Explanation:

Putting a = b = 1

option b) becomes ; b2x2 - a2y2 = a2b2

⇒ b2 (a2) sec2 θ - a2 (b tan2 θ) = a2b2

⇒ (a2b2) (sec2 θ - tan2 θ) = a2b2

⇒ sec2 θ - tan2 θ = 1

which is true

b2x2 - a2y2 = a2b2