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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 = 12sin^2x = 7/25 (I solved that myself)
sinx = 4/5 (given)
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 = 12sin^2x = 7/25 (I solved that myself) sinx = 4/5 (given)

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok we now sin^2(x)+cos^2(x)=1 replace for sin(x) and find cos(x) then find sin(2x)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0My notes are telling me to use the unit circle and to use the terminal point

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Bro 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

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'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
 one year ago
Best ResponseYou've already chosen the best response.0Sorry 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
 one year ago
Best ResponseYou've already chosen the best response.0They're my initials and I don't understand how to find a terminal point . I don't understand trigonometry whatsoever

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I don't see why my age is relevant lol

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Nothing its just that I've taken trig form when i was 14 😂😜 im 17 now

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0If you want me I can explain trig to you but it would take time

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how do you understand this

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0By using scalar product in the trig circle

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0what's scalar product

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Product of vectors, havent you heard of it?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Have you heard about the trig circle?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0is that unit circle ?
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