# As maths question confused about something

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#1
Why is that for cos you use the x co-ordinate and for sin you use the y co-ordinate? Thanks
0
2 years ago
#2
For cos it is adjacent/hypotenuse. Therefore x/1 =x
For sin it is opposite/hypotenuse. Y/1=y
0
#3
(Original post by dasda)
For cos it is adjacent/hypotenuse. Therefore x/1 =x
For sin it is opposite/hypotenuse. Y/1=y
ofcourse. tysm x
0
#4
(Original post by dasda)
For cos it is adjacent/hypotenuse. Therefore x/1 =x
For sin it is opposite/hypotenuse. Y/1=y
Also, sorry to disturb you again, but for part a how did they know the co-ordinates of the point? Did they put it into a calcualotr?
0
2 years ago
#5
(Original post by vix.xvi)
Also, sorry to disturb you again, but for part a how did they know the co-ordinates of the point? Did they put it into a calcualotr?
You're expected to know sine and cosine of 0, 30, 45, 60 and 90 degrees.
1
#6
(Original post by BuryMathsTutor)
You're expected to know sine and cosine of 0, 30, 45, 60 and 90 degrees.
ohh yeah lol thankss
1
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