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Example 1
Autor:
Walch Education
Find
if
.
GeoGebra
Set up the identity.
Substitute the values of the angles into the identity and simplify.
Verify the identity by calculating the sine of
and the cosine of
using a scientific calculator.
This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit
www.walch.com
for more information.
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