Trigonometry Practice Test 2

Question : 15 of 22

Marks: +1, -0

The value of tan20° tan40° tan80° is:

Solution:

tan 20° × tan 40° × tan 80°
= tan20° × tan (60° – 20°) tan (60° + 20°)
= tan (3 × 20°) = tan 60°

= √3

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