- HSN forum
- → Da King's Content

## Da King's Content

There have been 15 items by Da King (Search limited from 28-January 21)

### #97622 THE EXAM!

Posted by Da King on 15 May 2007 - 03:51 PM in Mathematics

### #97618 THE EXAM!

Posted by Da King on 15 May 2007 - 03:47 PM in Mathematics

### #97615 THE EXAM!

Posted by Da King on 15 May 2007 - 03:42 PM in Mathematics

### #80202 Higher Maths 2006

Posted by Da King on 19 May 2006 - 03:49 PM in Mathematics

anyone got a link to the solutions for this paper or higher physics paper?

### #80199 Higher Maths 2006

Posted by Da King on 19 May 2006 - 03:46 PM in Mathematics

For question 7 i got the 0,180,360 bit but not the other!

**Question 7 Paper 1**

sinx - sin2x = 0 (sin2x=2sinxcosx)

sinx - 2sinxcosx=0

sinx(1-2cosx)=0

sinx=0

**x=0, 180, 360**

OR

1-2cosx=0

cosx=1/2

**x=60, 300**

anyone got a link to the solutions for this paper or higher physics paper?

### #80193 Higher Maths 2006

Posted by Da King on 19 May 2006 - 03:40 PM in Mathematics

**Paper II - Q.10**

**Is this correct?**

**a.**k sin(x-a)

k sin x cos a - k coz x sin a

k cos a = 7

k sin a = 24

tan a = 24/7

a = 1.29 radians

k=√(7²+24²)

= 25

therefore,

25 sin (x-1.29)

**b.**differential sin x

= cos x

cos x=1

x=0

sin(x-1.29)=0

x-1.29=0

x=1.29 radians

**Paper II Q10**

a) is correct answer was

**25sin(x-1.29)**

b) dy/dx = gradient of curve

dy/dx = 25cos(x-1.29) (m=1 from question) so

25cos(x-1.29)=1

cos(x-1.29)=1/25

a=cos(inverse)(1/25)

=1.53

cos is +ve so quadrants 1 and 4

x-1.29=1.53, 4.75 (4.75 out of range) so

**x= 2.82 radians**

### #80188 Higher Maths 2006

Posted by Da King on 19 May 2006 - 03:36 PM in Mathematics

a) is correct answer was 25sin(x-1.29)

b) dy/dx = gradient of curve

dy/dx = 25cos(x-1.29) (m=1 from question) so

25cos(x-1.29)=1

cos(x-1.29)=1/25

a=cos(inverse)(1/25)

=1.53

cos is +ve so quadrants 1 and 4

x-1.29=1.53, 4.75 (4.75 out of range) so

x= 2.82 radians

### #80131 Higher Maths 2006

Posted by Da King on 19 May 2006 - 02:54 PM in Mathematics

### #80118 Higher Maths 2006

Posted by Da King on 19 May 2006 - 02:46 PM in Mathematics

### #80045 Higher Maths 2006

Posted by Da King on 19 May 2006 - 01:21 PM in Mathematics

### #80042 Higher Maths 2006

Posted by Da King on 19 May 2006 - 01:20 PM in Mathematics

### #80040 Higher Maths 2006

Posted by Da King on 19 May 2006 - 01:17 PM in Mathematics

### #80037 Higher Maths 2006

Posted by Da King on 19 May 2006 - 01:15 PM in Mathematics

### #80033 Higher Maths 2006

Posted by Da King on 19 May 2006 - 01:11 PM in Mathematics

- HSN forum
- → Da King's Content