 | Charles Bonnycastle - 1834 - 678 lapas
...And by the same process we obtain from the equations cos. (a + 6) = cos. a cos. b sin. a sin. b cos. (a b) = cos. a cos. b + sin. a sin. b the following (tl). . . cos. a cos. 6 = 5 jcos. (a + b) + cos. (a b)} (12). . . sin. a sin. 6 = {-... | |
 | Joseph Allen Galbraith - 1852 - 84 lapas
...E cos B, and E sin B (Prop. 1. Chap. III.), we obtain -J3) = E cos B cos A + BsinBsinA . therefore cos (A - B) = cos A cos B + sin A sin B. The values for the sine and cosine of the sum and difference of two angles are of the highest importance, as from... | |
 | Henry Nathan Wheeler - 1878 - 198 lapas
...a' < b' + d (§ 2J); ..180-A<180-B + 180-C;.-.B + CA<180° and £(B+CA) = SA<90°; .-. cos (SA) is positive, and in like manner cos (S B) and...(Plane Trig. [19]), cos £ (A ± B) = cos £ A cos £ B =F sin £ A sin £ B, the values for sin £ A, sin \ B, cos \ A, and cos \ B obtained in § 20, we... | |
 | Paul A. Foerster - 2003 - 808 lapas
...cos(A B). = cos A cos B - sin A sin B Cosine is an even function. Sine is an odd function. ... cos (A + B) = cos A cos B sin A sin B The only difference between this property and the one for cos (A B) is the minus sign between the terms... | |
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Trig. [19]), cos \ (A ± B) = cos \ A cos \ B ^ sin \ A sin \ B, the... 