Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Trigonometry

Question:

If sinθ - cosec θ = 11 , find the value of sin2θ + cosec2θ .

Options:

144

123

119

121

Correct Answer:

123

Explanation:

Formula I → [ sinθ = \(\frac{1}{cosecθ}\)]

Formula II → [If x - \(\frac{1}{x}\) = n and x2 + \(\frac{1}{x^2}\) = n2 + 2]

sinθ - \(\frac{1}{sinθ}\) = 11

⇒ sin2θ + \(\frac{1}{sin^2θ}\) = (11)2 + 2

⇒ sin2θ + cosec2θ = 121 + 2 = 123