English

(1 + tan θ + sec θ) (1 + cot θ – cosec θ) = ?

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Question

(1 + tan θ + sec θ) (1 + cot θ – cosec θ) = ?

Options

  • –1

  • 0

  • 1

  • 2

MCQ
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Solution

2

Explanation:

Given expression = `(1 + (sin θ)/(cos θ) + 1/(cos θ))(1 + (cos θ)/(sin θ) - 1/(sin θ))`

= `({(cos θ + sin θ) + 1}{(cos θ + sin θ) - 1})/(cos θ sin θ)`

= `((cos θ + sin θ)^2 - 1)/(cos θ sin θ)`

= `((cos^2θ + sin^2θ) + 2 sin θ cos θ - 1)/(cos θ sin θ)`

= `(2 sin θ cos θ)/(sin θ cos θ)`

= 2

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Chapter 13: Trigonometric identities - MULTIPLE-CHOICE QUESTIONS (MCQ) [Page 631]

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R.S. Aggarwal Mathematics [English] Class 10
Chapter 13 Trigonometric identities
MULTIPLE-CHOICE QUESTIONS (MCQ) | Q 4. | Page 631
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