1.

What is the value of tan 18°?

A. \(\frac{{\sqrt 5 - 1}}{{\sqrt {10 + 2\sqrt 5 } }}\)
B. \(\frac{{\sqrt 5 - 1}}{{\sqrt {10 + \sqrt 5 } }}\)
C. \(\frac{{\sqrt {10 + 2\sqrt 5 } }}{{\sqrt 5 - 1}}\)
D. \(\frac{{\sqrt {10 + \sqrt 5 } }}{{\sqrt 5 - 1}}\)
Answer» B. \(\frac{{\sqrt 5 - 1}}{{\sqrt {10 + \sqrt 5 } }}\)


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