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anonymous

  • one year ago

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)

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  1. anonymous
    • one year ago
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    Ok we now sin^2(x)+cos^2(x)=1 replace for sin(x) and find cos(x) then find sin(2x)

  2. anonymous
    • one year ago
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    My notes are telling me to use the unit circle and to use the terminal point

  3. anonymous
    • one year ago
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    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

  4. anonymous
    • one year ago
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    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

  5. anonymous
    • one year ago
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    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?

  6. anonymous
    • one year ago
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    They're my initials and I don't understand how to find a terminal point . I don't understand trigonometry whatsoever

  7. anonymous
    • one year ago
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    How old are you?

  8. anonymous
    • one year ago
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    17

  9. anonymous
    • one year ago
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    I don't see why my age is relevant lol

  10. anonymous
    • one year ago
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    Nothing its just that I've taken trig form when i was 14 😂😜 im 17 now

  11. anonymous
    • one year ago
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    If you want me I can explain trig to you but it would take time

  12. anonymous
    • one year ago
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    how do you understand this

  13. anonymous
    • one year ago
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    What trig?

  14. anonymous
    • one year ago
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    yeah lol

  15. anonymous
    • one year ago
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    By using scalar product in the trig circle

  16. anonymous
    • one year ago
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    what's scalar product

  17. anonymous
    • one year ago
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    Product of vectors, havent you heard of it?

  18. anonymous
    • one year ago
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    no ..

  19. anonymous
    • one year ago
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    Have you heard about the trig circle?

  20. anonymous
    • one year ago
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    is that unit circle ?

  21. anonymous
    • one year ago
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    ?

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