Elementary Trigonometry, Plane and Spherical

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ... the angle between O X and the positive direction of Q R, which is R Q; and that for the side O R is A--B. The projections of O Q are oQ' =oq cos A Oq" = Oq sin A or, by substituting for OQ its equivalent, OR cos B, as above given. o Q' = o R cos A cos B o Q" = o R sin A cos B The projections of QR are Q' R' =qr cos (4 ...

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