anonymous
  • anonymous
Please teach me the steps to solve this problem Suppose sin Alpha= 4/5, 0
Mathematics
katieb
  • katieb
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freckles
  • freckles
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|
freckles
  • freckles
find the adjacent side
freckles
  • freckles
you want to find the adjacent side so you find cos(alpha)

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

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