English

If tan θ = cot θ and 0° ≤ θ ≤ 90°, state the value of θ.

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Question

If tan θ = cot θ and 0° ≤ θ ≤ 90°, state the value of θ.

Sum
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Solution

tan θ = cotθ

tan θ  = `(1)/(tanθ )`

tan2 θ  = 1

tan θ  = 1

tan θ  = tan 45°

∴ θ  = 45°

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Chapter 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (C) [Page 323]

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Selina Concise Mathematics [English] Class 9 ICSE
Chapter 21 Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals]
EXERCISE 21 (C) | Q 8. (iii) | Page 323
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