Comments on: Chalanging Trig Problem? http://www.andersoncompositesquadron.org/composite-properties/chalanging-trig-problem Sun, 11 Jul 2010 12:55:59 -0400 http://wordpress.org/?v=2.8.4 hourly 1 By: notthejake http://www.andersoncompositesquadron.org/composite-properties/chalanging-trig-problem/comment-page-1#comment-1353 notthejake Thu, 18 Feb 2010 07:51:59 +0000 http://www.andersoncompositesquadron.org/composite-properties/chalanging-trig-problem#comment-1353 sin (A + B + C) = sin ((A + B) + C) = sin (A + B) cos C + cos (A + B) sin C = cos C(sin A cos B + cos A sin B) + sin C(cos A cos B - sin A sin B) = sin A cos B cos C + cos A sin B cos C + cos A cos B sin C - sin A sin B sin C These use the two angle sum formulas: sin (A + B) = sin A cos B + cos A sin B cos (A + B) = cos A cos B - sin A sin B<br><b>References : </b><br> sin (A + B + C) = sin ((A + B) + C) = sin (A + B) cos C + cos (A + B) sin C
= cos C(sin A cos B + cos A sin B) + sin C(cos A cos B – sin A sin B)
= sin A cos B cos C + cos A sin B cos C + cos A cos B sin C – sin A sin B sin C

These use the two angle sum formulas:
sin (A + B) = sin A cos B + cos A sin B
cos (A + B) = cos A cos B – sin A sin B
References :

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