Misc 20 - Chapter 5 Class 12 Continuity and Differentiability
Last updated at May 29, 2018 by Teachoo
Transcript
Misc 20 Using the fact that sin ( + )=sin cos +cos sin and the differentiation, obtain the sum formula for cosines. Given sin ( + )=sin cos +cos sin Consider A & B are function of Differentiating both side . . . . sin + = sin cos + cos sin sin + = sin . cos + cos . sin cos + . + = sin . cos + cos . sin cos + . + = sin . cos + cos A + cos . + sin . os A = cos . . cos B sin . sin sin . . sin + cos . . os A = cos . . cos B sin . B sin . . + cos B . . os A = cos cos sin sin + sin sin + cos cos = cos cos sin sin + Thus, cos + . + = cos cos sin sin + cos + . + + = cos cos sin sin cos + = cos cos + sin sin Hence proved
Miscellaneous
Misc 1
Misc 2
Misc 3
Misc 4
Misc 5 Important
Misc 6 Important
Misc 7 Important
Misc 8
Misc 9 Important
Misc 10
Misc 11 Important
Misc 12
Misc 13 Important
Misc 14 Important
Misc 15 Important
Misc 16 Important
Misc 17 Important
Misc 18
Misc 19 Important
Misc 20 You are here
Misc 21
Misc 22
Misc 23 Important
About the Author
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.