1MA 01. TRIGONOMETRIA/1MA.01.1 Raons 1MA.01.1.62Q cosinus amb b i c i pitàgores En un triangle rectangle, els catets b = #b i c = #c.
Calcula el cosinus de l'angle B.
(cal emprar el teorema de Pitàgores)
Format de la resposta: fracció simplificada i racionalitzada.

]]> a = «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msqrt»«mrow»«msup»«mi»b«/mi»«mn»2«/mn»«/msup»«mo»+«/mo»«msup»«mi»c«/mi»«mn»2«/mn»«/msup»«/mrow»«/msqrt»«/math» i cosB = c/a

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