![A treatise on plane and spherical trigonometry. D A FUNDAMENTAL rOBMULA 1 Then tlic triangles BOB and BOA are mutually eqauUBgnlthe three sides of the one being perp. to the three A treatise on plane and spherical trigonometry. D A FUNDAMENTAL rOBMULA 1 Then tlic triangles BOB and BOA are mutually eqauUBgnlthe three sides of the one being perp. to the three](https://c8.alamy.com/comp/2CEHNXX/a-treatise-on-plane-and-spherical-trigonometry-d-a-fundamental-robmula-1-then-tlic-triangles-bob-and-boa-are-mutually-eqauubgnlthe-three-sides-of-the-one-being-perp-to-the-three-sides-of-the-otherrespectively-therefore-the-angle-b-ce-=-a-ob-let-x=aob=bce-y-=-boc-then-fig-10-xy-=-cod-fig-11-x-y=c0b-and-in-fls-10gt8in-y-=-77=-co-=coco-v-cd-ba-ce-ba-ce-higll-bn-jr-=-go-qq-and-in-both-figures-l-a-59-co=x77-=-sinacos02-ctf-c-co-=-cxc7gt=coscsm-which-being-substituted-in-the-above-expressions-of-sin-x-y-and-sin-x-y-give-sin-x-2CEHNXX.jpg)
A treatise on plane and spherical trigonometry. D A FUNDAMENTAL rOBMULA 1 Then tlic triangles BOB and BOA are mutually eqauUBgnlthe three sides of the one being perp. to the three
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![Elements of Plane and Spherical Trigonometry by Elias Loomis | 9783337277208 | Reviews, Description and More @ BetterWorldBooks.com Elements of Plane and Spherical Trigonometry by Elias Loomis | 9783337277208 | Reviews, Description and More @ BetterWorldBooks.com](https://images.bwbcovers.com/333/Elements-of-Plane-and-Spherical-Trigonometry-Loomis-Elias-9783337277208.jpg)