Question

(4) For the trigonometric coalgebra (C,A, e) over a commutative ring R, where CRcRs, find expressions/formulae for use this to obtain directly formulae for cosrttu) and sin(ri ) in terms of cosz, and sin zs where Δη-1 (c) and A"-i (s), and lae for costtn) and sin(+ +n)

Answer 1

Given that

we have to use this to obtain directly formulae for
cos i +. +In
and
sin(ri + +an)
interms of cos x_i and sin x_i where i $\small \epsilon$ {1,...,n}.

tkn In