259:= intersection(x_axis, PB); QR = parallel(x_axis, Q); R = intersection(PB, QR); mark(R,P,Q, simple, 0.3); % alpha mark(B,O,Q, simple, 0.3); % alpha mark(Q,O,P, simple, 0.25); % beta mark(point(l_alpha, 2),Q,P, dotted, 0.2); draw("$ O$ ", O, .03, 220:); draw("$ P$ ", P, .03, 124:); draw("$ Q$ ", Q, .03, -34:); draw("$ R$ ", R, .03, 180:); draw("$ A$ ", A, .03, -90:); draw("$ B$ ", B, .03, -90:); draw("$ \alpha$ ", P, .18, -78:); draw("$ \alpha$ ", O, .17, 12:); draw("$ \beta$ ", O, .15, 42:); draw(segment(P,Q)); draw(segment(Q,R)); draw(segment(P,B)); draw(segment(Q,A)); draw(segment(O, point(x_axis, 1.0))); draw(segment(O, point(l_alpha, 1.1))); draw(segment(O, point(l_beta, 1.2)));
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box(-0.15, -0.15, 1.1, 1.1, 4.5); O = point(0, 0); x_axis = line(O, 0<); l_alpha = line(O, 24:); l_beta = line(O, 60:); P = point(l_beta, 1); PQ = perpendicular(l_alpha, P); Q = intersection(l_alpha, PQ); QA = perpendicular(x_axis, Q); A = intersection(x_axis, QA); PB = perpendicular(x_axis, P); B
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Matemàtiques (Prova d'accés a cicles formatius de grau superior)/Trigonometria
671:{{Information |Description=Diagram for proof of trigonometric sum formula. |Source=
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698:Proofs of trigonometric identities
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