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anonymous

  • one year ago

Please teach me the steps to solve this problem Suppose sin Alpha= 4/5, 0<Alpha<pie/2 and sin beta = 5/13, pie/2<beta<pie Find the exact value of sin 2Alpha sin(alpha-beta)

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  1. freckles
    • one year ago
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    do you remember the double angle identity for sine? \[\sin(2 \alpha)=2 \sin(\alpha)\cos(\alpha)\] also draw a right triangle in the appropriate quadrant. |dw:1436817504152:dw|

  2. freckles
    • one year ago
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    find the adjacent side

  3. freckles
    • one year ago
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    you want to find the adjacent side so you find cos(alpha)

  4. anonymous
    • one year ago
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    25-16=sqr9=3 so 2(4/5)(3/5)?

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