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Radical Expressions For Trigonometric Functions

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Radical Expressions For Trigonometric Functions

Postby nycmath » Sun Oct 04, 2026 2:08 pm

This exercise shows how to obtain radical expressions for sin 18° and cos 18°, using the figure.

A. Find angle B, Angle BDC, Angle ADC

B..Why does AC = BC = BD?

C. Why does CD = 1?
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