The Essentials of Plane And Spherical Trigonometry
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Tlien, sin (co.c)= tan (co. ^1) tan (co. B), or cose = cot.l cot^.
4. For the check formula, the circular parts are a, b, and co. B; a is the middle part, and b and co. B are adjacent parts. Then, sin a — tan b tan (co. B) = tan b cot B.
151. lu solving spherical triangles, cnreful attention mnst be paid to the ah/ehraic signs of the functions ; the cosines, tangents, and cotangents of angles greater than 1)0° being taken negative.
It is convenient to place the sign of each function just above ...or below it. as illustrated in the examples of Art. lo3 ; the sisfn of the function in the first member beino- then deter- mined in accordance willi the i>rinciple that like signs pro- duce -h, and unlike signs produce — .
Note. In the examples after tlie first of Art. 153, the signs are omitted in every case wliere both factors of the second member are +.
152. In finding the angles corresponding, if the function is a cosine, tangent, or cotangent, its sign determines whether the angle is less or greater than 1)0° ; that is, if it is +, the angle is 90°, and the supplement of the acute angle obtained from the tables must be taken (Art.
What to read after The Essentials of Plane And Spherical Trigonometry?
You can find similar books in the "Read Also" column, or choose other free books by Webster Wells to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Tlien, sin (co.c)= tan (co. ^1) tan (co. B), or cose = cot.l cot^.
4. For the check formula, the circular parts are a, b, and co. B; a is the middle part, and b and co. B are adjacent parts. Then, sin a — tan b tan (co. B) = tan b cot B.
151. lu solving spherical triangles, cnreful attention mnst be paid to the ah/ehraic signs of the functions ; the cosines, tangents, and cotangents of angles greater than 1)0° being taken negative.
It is convenient to place the sign of each function just above ...or below it. as illustrated in the examples of Art. lo3 ; the sisfn of the function in the first member beino- then deter- mined in accordance willi the i>rinciple that like signs pro- duce -h, and unlike signs produce — .
Note. In the examples after tlie first of Art. 153, the signs are omitted in every case wliere both factors of the second member are +.
152. In finding the angles corresponding, if the function is a cosine, tangent, or cotangent, its sign determines whether the angle is less or greater than 1)0° ; that is, if it is +, the angle is 90°, and the supplement of the acute angle obtained from the tables must be taken (Art.
What to read after The Essentials of Plane And Spherical Trigonometry?
You can find similar books in the "Read Also" column, or choose other free books by Webster Wells to read onlineMoreLess
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