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TRIGONOMETRIC FORMULAE <br /> B B B <br /> y v <br /> [' a a <br /> f <br /> { a A a <br /> Right Triangle a `-----Oblique Triangles C <br /> Solution of Right Triangles <br /> J a b <br /> 5 > - For Angle A. sin —— cos— tan— a o <br /> e . e � b ,.cot= —,sec= 'cosec <br /> = — <br /> '< (liven Required a <br /> J ay A, B,e tanA=a- cotB,c= a + •=a 1 + _ <br /> a9 <br /> A, B, b sin A——c <br /> = a a <br /> , c— =c — <br /> t_ <br /> b, c' B=90°—A,b =a cotA,c= sin A. <br /> 9. J b��� /u T B',a, o B=90°A ' <br /> ,a = btan.4c= <br /> /- l cos.A. <br /> -B,a, b B=90-A,a=csin A,b—ccosA, <br /> !>tiss : Required <br /> Solution of Oblique Triangles <br /> asinB <br /> � <br /> B,a b, c, 0 b snA ' C= 180°—(A+B), c=asinC <br /> sin A <br /> bin A <br /> ? dr cj,.b B,c, C sin B= ,C= 180°—(A+B),c _ a sin C <br /> �- _ a sin A <br /> �L o; b, 0 A,B, c A+B=180°—C,tan (A—B)—— a—b tan (A+B) <br /> a+ b <br /> V V a sin C <br /> yc = <br /> sin A <br /> !9 ,...y b, a A, B, C a—a °�sinjA—� <br /> � _ "«► sin}B=� —oa ,C=180°=(A+B) <br /> a, b, c Area 8=E ,area = s a—a s— a—c <br /> A, b, a Area b e sin A <br /> f -1 area = 2 <br /> d,B,C,a Area area a as sin B sin Ci <br /> ' <br /> `� ? 2snnA <br /> REDUCTION TO HORIZONTAL <br /> > Horizontal dtstanoe=Slope distance multiplied by the <br /> --2— cosine otthf ver icalantde.Thus:siopedietsnee=E10.41t. <br /> � ° Yert angle—b°16". From Tabid,Pass XX cos 561W= <br /> 9660. Horizontal distance-19.4XAYo—Rd9I <br /> J.o0.Li$ p 11O�°ntal distance also=Slope=istance minus slo <br /> dlstaace times(1-cosine o! cal an91e). With t�e <br /> saasa as in the preceding example,JIM <br /> distance lna'r iIssobtained.Costae 6°IN=.9960.1—.9969=.6641. <br /> N&4XAU�l.SL alarl u=>ns oo to <br /> 'A'hmae rue is thwhorlsontiti dhRasce —flue slope dist <br /> dace less the sdnsrs of b!twtee diNanewe' ' ss:rLw=14 i4, <br /> elope distance I Le it. horizontal atstanoe.ft6-1-�4 <br /> 2 X 8626 <br /> MADE IN Y.S.A. <br /> OF <br /> r <br /> 1, _. - • , <br /> f • <br />