Hakim Para, Siliguri 
3 students Details verified of Subhash Kumar✕
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Tutor's home Best teaching, easy to understand, friendly behaviour, best for the students who are appearing for boards or IIT JEE. Highly recommended
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Hindi Proficient
MIT Muzaffarpur 2007
Bachelor of Engineering (B.E.)
Hakim Para, Siliguri, India - 734001
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Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Class 9 Tuition
4
Board
ICSE, CBSE, State
Subjects taught
Mathematics, Science
Taught in School or College
No
1 Student Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Class 10 Tuition
4
Board
ICSE, CBSE, State
Subjects taught
Science, Mathematics
Taught in School or College
No
Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Class 11 Tuition
5
Board
State, CBSE, ISC/ICSE
Subjects taught
Mathematics, Physics
Taught in School or College
No
Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Class 12 Tuition
5
Board
State, NIOS, CBSE, ISC/ICSE
Subjects taught
Mathematics, Physics
Taught in School or College
No
Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Engineering Diploma Tuition
4
Engineering Diploma Branch
Engineering Diploma 1st Year
Engineering Diploma Subject
Engineering Mathematics, Basic Math, Basic Physics
Type of class
Crash Course, Regular Classes
Class strength catered to
One on one/ Private Tutions, Group Classes
Taught in School or College
No
5 out of 5 1 review
Pushkar Dutt
"Best teaching, easy to understand, friendly behaviour, best for the students who are appearing for boards or IIT JEE. Highly recommended "
Have you attended any class with Subhash?
Answered on 12/05/2020 Learn CBSE - Class 11/Mathematics/Mathematics/Unit-II: Algebra/Complex Numbers and Quadratic Equations/NCERT Solutions/Miscellaneous Exercise 5
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Post a Lesson
Let
Z1= cosA + i sinA where Re(Z1) = cosA & Im(Z1) = sinA
Z2= cosB + i sinB where Re(Z2) = cosB & Im(Z2) = sinB
Z1*Z2=(cosA + i sinA)*(cosB + i sinB)=cosA*cosB+cosA* (i sinB)+(i sinA)* cosB+(i sinA)*(i sinB)
= cosA*cosB + i (cosA*sinB + sinA*cosB) +(-1) sinA*sinB
= (cosA*cosB - sinA*sinB) + i (cosA*sinB + sinA*cosB)
Hence,
Re ( Z1*Z2) = (cosA*cosB - sinA*sinB) = Re(Z1) *Re(Z2) - Im(Z1) *Im(Z2)
Like 0 
Answers 48 
Comments Answered on 24/04/2017
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Post a Lesson
Like 0 Answers 125 Comments Answered on 24/04/2017
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Post a Lesson
Like 0 Answers 214 Comments Ask a Question
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Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Class 9 Tuition
4
Board
ICSE, CBSE, State
Subjects taught
Mathematics, Science
Taught in School or College
No
1 Student Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Class 10 Tuition
4
Board
ICSE, CBSE, State
Subjects taught
Science, Mathematics
Taught in School or College
No
Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Class 11 Tuition
5
Board
State, CBSE, ISC/ICSE
Subjects taught
Mathematics, Physics
Taught in School or College
No
Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Class 12 Tuition
5
Board
State, NIOS, CBSE, ISC/ICSE
Subjects taught
Mathematics, Physics
Taught in School or College
No
Class Location
Online class via Zoom
Student's Home
Tutor's Home
Years of Experience in Engineering Diploma Tuition
4
Engineering Diploma Branch
Engineering Diploma 1st Year
Engineering Diploma Subject
Engineering Mathematics, Basic Math, Basic Physics
Type of class
Crash Course, Regular Classes
Class strength catered to
One on one/ Private Tutions, Group Classes
Taught in School or College
No
5 out of 5 1 review
Pushkar Dutt
"Best teaching, easy to understand, friendly behaviour, best for the students who are appearing for boards or IIT JEE. Highly recommended "
Have you attended any class with Subhash?
Answered on 12/05/2020 Learn CBSE - Class 11/Mathematics/Mathematics/Unit-II: Algebra/Complex Numbers and Quadratic Equations/NCERT Solutions/Miscellaneous Exercise 5
Ask a Question
Post a Lesson
Let
Z1= cosA + i sinA where Re(Z1) = cosA & Im(Z1) = sinA
Z2= cosB + i sinB where Re(Z2) = cosB & Im(Z2) = sinB
Z1*Z2=(cosA + i sinA)*(cosB + i sinB)=cosA*cosB+cosA* (i sinB)+(i sinA)* cosB+(i sinA)*(i sinB)
= cosA*cosB + i (cosA*sinB + sinA*cosB) +(-1) sinA*sinB
= (cosA*cosB - sinA*sinB) + i (cosA*sinB + sinA*cosB)
Hence,
Re ( Z1*Z2) = (cosA*cosB - sinA*sinB) = Re(Z1) *Re(Z2) - Im(Z1) *Im(Z2)
Like 0 Answers 48 Comments Answered on 24/04/2017
Ask a Question
Post a Lesson
Like 0 Answers 125 Comments Answered on 24/04/2017
Ask a Question
Post a Lesson
Like 0 Answers 214 Comments Ask a Question
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Siliguri
