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MATH 3350 Practice Angle Summation One computation not in our book are the angle summation laws of trigonom- etry sin(a + β)
Figure 2: Right Triangles We ask the reader to complete the proof of the angle summation formulas. (A) First, show that LDCX
CD sin(B) AC cos(8) sin(3) cos a) DX CX -in(a)sin(β) sin (a)sin(a) cos(a) XY ::sin(a) cos(β) ( AY cos(a) cos(8)-sin(a) sin(8)

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