Tan Ribbon
Need help with Q 11 on sin cos tan?
I do not understand how this issue to help would be appreciated. Display stages of labor and additional information if necessary. If u can not read the extra info, it says k = tan ribbon / tan B (I do not know the symbol of the tape) http://i300.photobucket.com/albums/nn29/SungMach/rytyr.jpg
(k-1) sin (a + b) = (k +1) sin (ab) k = tan a / tan b ------------------ k - 1 = tan a / tan b - 1 = sin a cos b / cos a sin b - 1 k - 1 = [sin a cos b - cos a sin b] / cos a sin k - 1 = sin (a -- b) / cos a sin b --------------- (1) ========== ================== K + 1 = tan a / tan b + 1 = sin a cos b / cos a sin b + 1 + 1 = k [sin a cos b + cos a sin b] / cos a sin bk + 1 = sin (a + b) / cos a sin b --------------- (2) ==================== fracture 2 equs (k-1) / (k +1) = sin (ab) / sin (a + B) (k-1) sin (a + b) = (k +1) sin (ab) has proved
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