October 10, 2015

Homework Help: Mathematics

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

1. Show that Sin3 - Cos2 = (1 - Sin)(4Sin^2 + 2Sin - 1).
Without using a calculator, show that = 18 degrees is an exact solution of the equation Sin3 = Cos2.
Justifying your answer, find the exact values of:
i) Sin18 degrees.
ii) Sin234 degrees.

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