Angle Addition Formulas (Trigonometry): Difference between revisions

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-[asy]
-real a,b,c;
-a=0.4924;
-b=0.5467;
-c=a+b;
-pair A,B,C,D,E,F;
-A=(0,0);
-D=(cos(c),sin(c));
-B=(cos(a)*cos(b),0);
-C=(cos(a)*cos(b),sin(a)*cos(b));
-draw(A--B--C--D--cycle);
-draw(A--C);
-E=foot(D,A,B);
-draw(D--E);
-F=foot(C,D,E);
-draw(C--F);
-draw(anglemark(B,A,C,4));
-draw(anglemark(C,A,D,5.5));
-label("<math>\alpha</math>", A ,7*dir(a*30));
-label("<math>\beta</math>", A ,9*dir(b*45+ a*30));
-[/asy]

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