February 28, 2017

Homework Help: Mathematics

Posted by Edwards on Wednesday, August 3, 2011 at 9:27am.

1. Show that Sin3è - Cos2è = (1 - Sinè)(4Sin^2è + 2Sinè - 1).
Without using a calculator, show that è = 18 degrees is an exact solution of the equation Sin3è = Cos2è.
Justifying your answer, find the exact values of:
i) Sin18 degrees.
ii) Sin234 degrees.

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