البحث:

http://up.top4top.net/downloadf-top4top_34c33bf8501-pdf.html

Double-Angle and Half-Angle Identities

Using identities to find sin 18


http://up.top4top.net/downloadf-top4top_860e7651431-pdf.html

http://alnasiry.net/forums/uploaded/377_u3.png

السلا عليكم الناتج هو 243

http://im79.gulfup.com/ihTx3G.jpg

http://alnasiry.net/forums/uploaded/541_01-11-2014.gif

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