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Math15

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Mathematics
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Q-1 solution
Question 2:
Convert the following polar coordinates to Cartesian/rectangular coordinates.
(a)
)
6
,4(
Conversion from polar to rectangular coordinate is :
b
a
d
e
c

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32
2
3
4)
6
cos(4)cos( ====
rx
And
( )
2
2
4
6
sin4sin ==
==
ry
Thus, the rectangular coordinate is
( )
2,32
(b)
)
3
,2(
Conversion from polar to rectangular coordinate is :
And
( )
3
3
sin2sin =
==
ry
Thus, the rectangular coordinate is
( )
3,1
(c)
2
3
,1
Conversion from polar to rectangular coordinate is :
0)
2
3
cos(1)cos( ===
rx
And
( )
1
2
3
sin1sin =
==
ry
Thus, the rectangular coordinate is
( )
1,0
Question 3:
(a) (1,1)
The polar form of rectangular coordinate (x, y) is
( )
,r
.
Where
211
22
=+=+= yxr
and
4
tan
1
=
=
x
y
Thus, polar of (1, 1) is
4
,2
.
(b)
)1,1(
(c) The polar form of rectangular coordinate (x, y) is
( )
,r
.
(d) Where
211
22
=+=+= yxr
and
=
= 315tan
1
x
y
(e) Thus, polar of (1, 1) is
( )
315,2
.

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Q-1 solution b a d e c Question 2: Convert the following polar coordinates to Cartesian/rectangular coordinates. (a) ( 4,  6 ) Conversion from polar to rectangular coordinate is :  3 x  r cos( )  4 cos( )  4  2 3 6 2   4 And y  r sin    4 sin     2 6 2  Thus, the rectangular coordinate is 2 3 ,2 (b) ( 2,  3  ) Conversion from polar to rectangular coordinate is :  1 x  r cos( )  2 cos( )  2   1 3 2    3 3 And y  r sin    2 sin   Thus, the rectangular coordinate is  1, 3   3    2  (c) 1, Conversion from polar to rectangular coordinate is : 3 )0 2  3  And y  r sin    1sin    1  2  x  r cos( )  1cos( Thus, the rectangular coordinate is 0,1 Question 3: (a) (1,1) The polar form of rectangular coordinate (x, y) is r ,  . y   x 2  y 2  1  1  2 and   tan 1    x  4   Thus, polar of (1, 1) is  2 ,  . 4  Where r  (b) (1,1) (c) The polar form of rectangular coordinate (x, y) is r ,  . (d) Where r  y x 2  y 2  1  1  2 and   tan 1  x (e) Thus, polar of (1, 1) is   2 ,315 .     315  Question 4: (a) 4+3i The polar form of the complex number z=a+bi is: z=r⋅ (c ...
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