anonymous
  • anonymous
prove: sin y+tan y/ over /1+ sec y =sin y
Precalculus
katieb
  • katieb
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geerky42
  • geerky42
Like this? \(\dfrac{\sin y + \tan y}{1 + \sec y} = \sin y\)
anonymous
  • anonymous
yes
geerky42
  • geerky42
Start with this: \[ \dfrac{\sin y + \tan y}{1+\sec y} \cdot \dfrac{1-\sec y}{1-\sec y} \] Then multiply both fractions together then simplify.

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geerky42
  • geerky42
Get it?
anonymous
  • anonymous
yep
geerky42
  • geerky42
Oh, and remember these trigonometry identify: 1−sec²x = −tan²x
geerky42
  • geerky42
Please let me know when you are stuck, ok?
anonymous
  • anonymous
yea im bad at math so im stuck
geerky42
  • geerky42
In what step are you stuck at?
anonymous
  • anonymous
just cant do it

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