nam 發問於 科學及數學數學 · 1 十年前

concerning arithmetic means pls

22.If the arithmetic means of sin0 and tan45 is cos x,find x where 0 < x < 90

answers:60 How can find that??

(miss degree sign)

1 個解答

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  • 1 十年前
    最愛解答

    arithmetic means of a set of real no:{a1,a2,a3,....,an}=summation(a1,a2,a3,....,an) /n

    So, arithmetic means of sin0 and tan45 is : (sin0+tan45)/2=1/2=cos x

    easy to get x=60 (special angle)

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