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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: a)Cho cos a=3/4.Tính sin a, cot a, tan a.

Toán Lớp 8: a)Cho cos a=3/4.Tính sin a, cot a, tan a.

Comments ( 2 )

  1. Giải đáp + giải thích các bước giải:
     

    toan-lop-8-a-cho-cos-a-3-4-tinh-sin-a-cot-a-tan-a

  2. $sin^2\alpha+cos^2\alpha=1$
    $sin^2\alpha=1-cos^2\alpha$
    $sin^2\alpha=1-\bigg(\dfrac{3}{4}\bigg)^2$
    $sin^2\alpha=\dfrac{7}{16}$
    $sin\alpha=\dfrac{\sqrt[]{7}}{4}$
    $tan\alpha=\dfrac{sin\alpha}{cos\alpha}=\dfrac{\sqrt[]{7}}{3}$
    $cot\alpha=\dfrac{1}{tan\alpha}=\dfrac{3}{\sqrt[]{7}}$

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222-9+11+12:2*14+14 = ? ( )