anonymous
  • anonymous
if sinx = 4/5 and x is in the first quadrant, find sin2x What I know : sin2x = 2sinxcosx (in my notes) cos2x = 1-2sin^2x = -7/25 (I solved that myself) sinx = 4/5 (given)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
Ok we now sin^2(x)+cos^2(x)=1 replace for sin(x) and find cos(x) then find sin(2x)
anonymous
  • anonymous
My notes are telling me to use the unit circle and to use the terminal point
anonymous
  • anonymous
Bro thats straight forward you got 16/25 +cos^2(x)=1 then cos^2(x)=9/25 then cos(x)=3/5 therfore sin(2x)=2(3/5)(4/5)=24/25 thats it i gave you the answer

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anonymous
  • anonymous
I'm a girl, not a "bro" and obviously it's not straight forward to me since I'm asking for help . I don't understand the terminal points and I'm taking an algebra 2 class and it's apparently trigonometry is apart of algebra 2
anonymous
  • anonymous
Sorry i had no idea what sex are you since your username didn't signify anything well yeah thats trig and it seems that you wrote in your notes everything that i just used what is the problem?
anonymous
  • anonymous
They're my initials and I don't understand how to find a terminal point . I don't understand trigonometry whatsoever
anonymous
  • anonymous
How old are you?
anonymous
  • anonymous
17
anonymous
  • anonymous
I don't see why my age is relevant lol
anonymous
  • anonymous
Nothing its just that I've taken trig form when i was 14 😂😜 im 17 now
anonymous
  • anonymous
If you want me I can explain trig to you but it would take time
anonymous
  • anonymous
how do you understand this
anonymous
  • anonymous
What trig?
anonymous
  • anonymous
yeah lol
anonymous
  • anonymous
By using scalar product in the trig circle
anonymous
  • anonymous
what's scalar product
anonymous
  • anonymous
Product of vectors, havent you heard of it?
anonymous
  • anonymous
no ..
anonymous
  • anonymous
Have you heard about the trig circle?
anonymous
  • anonymous
is that unit circle ?
anonymous
  • anonymous
?
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