Trigonometry & Inverse Trigonometry
Multiple Angle Formulas
Grade 11
Question:
<p>The value of <span class="math">\(\tan \frac{\pi}{7} \tan \frac{2\pi}{7} \tan \frac{3\pi}{7}\)</span> is</p>
<p>(a) 1</p>
<p>(b) <span class="math">\(\frac{1}{7}\)</span></p>
<p>(c) 7</p>
<p>(d) None</p>
Step-by-Step Solution
Key Concept: Use the identity for product of tangents at equally spaced angles in terms of multiples of π/7.
<p>Not provided in source material</p>
Correct Answer: c