Triangles AOC and BOD are congruent by SAS. Therefore, and these lengths can be found using the . Because this is the unit circle, the coordinates of points A, B, and D are equal to cosine and sine of α + β, α, and –β, respectively. Write expressions for the lengths and set them equal. Rewrite cos(-β) and sin(-β) using the identities before squaring both sides of the equation. Simplifying the resulting expressions involving cosine and sine of α, β, and α + β requires using the identity. When simplified, the equation becomes cos(α + β) = cos(α)cos(β) - sin(α)sin(β).

b is the correct answer

that’s a nice boss :

dont know what all this is english this is america.

henry david thoreau and ralph warren emerson earned the name transcendentalists.you could assume that transcendentalists come from a well educated background from people that were alive before the american civil war.these people, mostly new englanders, mostly around boston, were attempting to create a uniquely american body of literature. it was already decades since the americans had won independence from england. and so they deliberately went about creating literature, essays, novels, philosophy, poetry, and other writing that were clearly different from anything from england, france, germany, or any other european nation.another way to look at the transcendentalists is to see them as a generation of people struggling to define spirituality and religion in a way that took into account the new understandings their age made available.